Tire size question
Question:
Ok, the time has come for me to replace my tires finally. I want to fit the largest tire possible on the factory rim without any suspension modification. Can I get a 31 on there or just a 30.5 without interfering with the well. Thanks, Bryan
Response:
Bryan, I am in the process of searching for the same exact info. My rims are 16", and the stock Firestones are P255/70/R16 . What are yours? As I gather my info., which I am researching today, I’ll be sure to post my results to this newsgroup. Scott 97 Sport 4.0 SOHC – Hide quoted text — Show quoted text – >Ok, the time has come for me to replace my tires finally. I want to fit the >largest tire possible on the factory rim without any suspension modification. >Can I get a 31 on there or just a 30.5 without interfering with the well. >Thanks, Bryan
Response:
You guys live anywhere near NYC ? I have my original tires (Firestone 235/75/R15 Wilderness AT) and rims for sale. The rims are the Ford Limited Edition rims. Pretty Nice Looking. The tires have 6500 miles on them. I’ll send JPG’s of them to anyone who e-mails me. 98 Xplorer Limited
Response:
I do live in NYC, but I already have 255/70/r16’s on the nice, deep dish shiny alloy rims. I am looking to get rid of the crap Firestones for Good Year Wranger RT/S, Michelin LTX M/S, Bridgestone Duellers or BF Goodies. What I think I have found out is that I can move up to 30.5 x 9.5 x 16 without any rubbing or other problems, and now I am up to the point of shopping around for the best deals. – Hide quoted text — Show quoted text – >You guys live anywhere near NYC ? >I have my original tires (Firestone 235/75/R15 Wilderness AT) and rims for >sale. The rims are the Ford Limited Edition rims. Pretty Nice Looking. >The tires have 6500 miles on them. >I’ll send JPG’s of them to anyone who e-mails me. >98 Xplorer Limited
Response:
Well, Let us know what pans out with your shopping around. There are alot of us looking for good deals in NYC area ! ToneDog – Hide quoted text — Show quoted text – >I do live in NYC, but I already have 255/70/r16’s on the nice, deep dish >shiny alloy rims. I am looking to get rid of the crap Firestones for Good >Year Wranger RT/S, Michelin LTX M/S, Bridgestone Duellers or BF Goodies. >What I think I have found out is that I can move up to 30.5 x 9.5 x 16 >without any rubbing or other problems, and now I am up to the point of >shopping around for the best deals. >You guys live anywhere near NYC ? >I have my original tires (Firestone 235/75/R15 Wilderness AT) and rims for >sale. The rims are the Ford Limited Edition rims. Pretty Nice Looking. >The tires have 6500 miles on them. >I’ll send JPG’s of them to anyone who e-mails me. >98 Xplorer Limited
Response:
BCT, My Dad’s running BFG 30×9.5s on his ‘96 with no troubles through the entire articulation range. I visited a web site some time back and saw pictures of a Phoenix doctor’s ‘93 that had 10.5x 31s and he claimed no rubbing. I’ve got 10.5×31s on my ‘92 but I’ve also got a 2.5" lift. Still, I have plenty of room left over. Be cognizant that informed sources recommend a tire width no greater than rim width + 2". I’ve got 10.5s on a 7" rim so I’m out of specs but I stay carefull. Bob
Response:
OK. Made my choice. I went with Goodyear Wranger RT/S, size 255/70/R16. Why? Three reasons actaully: 1) $20-30 a tire cheaper than Michelin LTX M/S 2) In my honest opinion, the Goodyears look better on my 97 Sport w/premium sport package than the Michelins. Call it a beefier tread, a more agressive styling, or nicer white lettering. 3) For all intent and purposes, the Goodyear Wrangler RT/S is rated just about the same as the Michelin Now for the feedback. I had no idea how incredibly shitty a tire the Firestone Wilderness AT was until I changed to the Goodyear. Difference is night & day. The ride is sooooo smooth, and the Goodyears have superior sidewall strength, which minimizes body lean and increases steering response. No report yet on wet traction but the tread pattern is much more agressive and channeled than the Firestones, so I’m sure I will be happy with the performance. Road noise is about the same, which is minimal for me. Overall I have to say that short of being the designer, high end tire the Michelin is, the Goodyear is the best runner up out there. Scott 97 Sport 4.0 SOHC with new tires – Hide quoted text — Show quoted text – >Ok, the time has come for me to replace my tires finally. I want to fit the >largest tire possible on the factory rim without any suspension modification. >Can I get a 31 on there or just a 30.5 without interfering with the well. >Thanks, Bryan
Response:
Ed, your point is well taken. Sometimes following someone else’s recommendations is good, sometimes it’s not. Sometimes you just have to find out for yourself. Ron
– Hide quoted text — Show quoted text -> Bob, > Don’t listen to anyone who tells you the 1050’s won’t fit. I was told the same > thing when I wanted to upgrade my tires…I even settled for the 950’s because > that is what the tire shops said was the largest tire size possible. What a > waist of money that was, because…with the aid of this news group, I began > seeing posts stating that the 1050s would indeed fit. > I went out and bought a set and put them on (after arguing with the tire shop > about whether they would fit or not..I told them that it was my truck and to > just do it). Anyway, they fit fine, no rubbing or scrapping. No stressed > drive train, nothing. The tires will fit on the stock 15 inch rims fine, and > will travel the full length of the suspension. The decision is yours, but I > will tell you that I have put not only 1050 ATVs on, but also used to run Mud > King studded 1050’s during the winter months (I recently moved from Alaska). > Never had any problem and they looked great. > My two cents > Edward A. Brusher, LCSW > CPT, MS > United States Army
Response:
Bob, Don’t listen to anyone who tells you the 1050’s won’t fit. I was told the same thing when I wanted to upgrade my tires…I even settled for the 950’s because that is what the tire shops said was the largest tire size possible. What a waist of money that was, because…with the aid of this news group, I began seeing posts stating that the 1050s would indeed fit. I went out and bought a set and put them on (after arguing with the tire shop about whether they would fit or not..I told them that it was my truck and to just do it). Anyway, they fit fine, no rubbing or scrapping. No stressed drive train, nothing. The tires will fit on the stock 15 inch rims fine, and will travel the full length of the suspension. The decision is yours, but I will tell you that I have put not only 1050 ATVs on, but also used to run Mud King studded 1050’s during the winter months (I recently moved from Alaska). Never had any problem and they looked great. My two cents Edward A. Brusher, LCSW CPT, MS United States Army
Response:
This has most likely been asked a hundred times but I could not locate the answer to my question. Will 31X10.5’s fit and work ok on the stock 15 inch rims of my 97 XLT? I have the stock 235 car tires on it now and would like a little bigger tire on it. Anyone have any experiences with this or suggestions? Thanks Bob
Response:
My son has a 96 XLT four door, and was told a 30" X 9.5" was the largest tire he could put on with out problems. B.F. Goodrich recommends an 8" wide rim for a 31" X 10.5". Ron
– Hide quoted text — Show quoted text -> This has most likely been asked a hundred times but I could not locate the > answer to my question. Will 31X10.5’s fit and work ok on the stock 15 inch > rims of my 97 XLT? I have the stock 235 car tires on it now and would like a > little bigger tire on it. Anyone have any experiences with this or > suggestions? > Thanks > Bob
Response:
Actually the REAL milage may suffer by going to a larger tire. True you will cover a larger distance for every turn of the drive shaft. The important thing is what RPM is the engine running. There is a rough formula to take 60% and 80% of the RPM where your engine develops max HP. Now you want the engine to operate within this window most of the time. Larger tires will reduce the engine RPM and if it drops below the 60% level you will LOSE milage. Some of my friends had Blazers with 3.07 gears and I have 3.73. We all went to 33X12.50’s. I ran about 2400 RPM and they were about 1900. I got 13-16 MPG they got 10-13. Yeah I know we all drive differently but some trips were together on the highway for several hundred miles. You can change the DRIVEN gear on the trans to correct the error on cable driven speedos but have to reprogram the newer ones I guess since they take the data from the speed sensor I think. Drive on a marked road and check your Odometer against the milage markers over about 10-20 miles. This is easier then trying to maintain a certain speed against the speedometer. The odometer and speedometer will have the same percentage of error.
Response:
Offset ratio: 1.039 * Speedo(mph) — — 98 Camaro Money can’t buy happiness, but it sure makes misery easier to live with.
– Hide quoted text — Show quoted text -> P235/75/R15
Response:
I have P255/70/R16 ’s on my 94 S10 Blazer. How much, if at all should this affect my speed/odometer readings?
Response:
What was the OEM tire size? — — 98 Camaro Money can’t buy happiness, but it sure makes misery easier to live with.
– Hide quoted text — Show quoted text -> I have P255/70/R16 ’s on my 94 S10 Blazer. How much, if at all should this > affect my speed/odometer readings?
Response:
P235/75/R15
Response:
Not much! 235/75/15 is 28.9" diameter, 255/70/15 is a 29.1" diameter. These numbers are give/take numbers, they WILL vary by manufacturer… > P235/75/R15
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Response:
Original: LT265/75R16 = 637 Rev. Per Mile 285/75R16 = 614 Rev. Per Mile (-23) Speedo * 0.963 = Actual Speed 245/75R16 = 697 Rev. Per Mile (+60) Speedo * 1.086 = Actual Speed FORMULA REV PER MILE Width * Aspect Ration = Tire Height(mm) Tire Height(mm) / 25.4 = Tire Height(in) Tire Height(in) * 2 = Tire Contribution to Diameter Tire Contribution to Diameter + Wheel Diameter = Total Diameter(in) Total Diameter(in) / 12 = Total Diameter(ft) Total Diameter(ft) * 3.14 = Tire Circumference(ft) 5280 / Tire Circumference(ft) = Rev. Per Mile OFFSET RATIO Rev Per Mile of Original Tire – Rev Per Mile of New Tire = Rev Offset Rev Offset * New Tire Curcumference = Offset per mile(ft) 5280 – Offset per mile(ft) / 5280 = Offset Ratio > 1) Can I go up in size to 285/75R16? Are there any negative effects, e.g. > will my speedometer be off by a lot? > 2) I have a ‘98 GMC Suburban that has some old LT245/75R16 tires. Can I put > the 265/75R16 tires from my Silverado on the Suburban? Again, are there any > negative effects or will they work fine on the Suburban? > Thanks in advance for any advice. > —
– 98 Camaro
Response:
The first number is the width of the tread in millimeters, The next is the percentage of that width that is the hieght of the sidewall. To stay the same on your speedometer wider tires need lower sidewall percentages. I went to 235/75R15 on a Blazer from 235/70R15, The speedometer is reading slightly low now (1-2 MPH ) In your case you’re adding 75% of 20mm = 15mm or about 1.25 inches in hieght (I doubled it to 30 as tread to rim to tread again). That will likely throw off the speedometer by a good 5-7 mph on both vehicles. It will help actual gas mileage though as fewer turns of the wheels cover the same distance. Calculating with the odometer on the vehicle will not tell you this though as it is off too. 100 actual miles may only read 92-95 on the odometer. This is too much math!
– Hide quoted text — Show quoted text -> I just bought a 2001 Silverado Z71. It came with LT265/75R16 Firestone > tires. I would like to switch to BFGoodrich All-Terrain T/A tires. I have > two questions:
Response:
Kevin: Thanks for the info. So you put Goodyear 285/75 tires on your stock 16×7 rims, without any type of lift kit, and they fit with no rubbing, correct? How do they look? How much height increase did you get? Also, what’s that "HyperTech Power Programmer"? (As you can tell, I’m a newbie at this stuff). Thanks again, Jim
… – Hide quoted text — Show quoted text -> I’ve done this on my 2001 Tahoe (same 16×7 rims). They will fit with no > rubbing, at least Goodyear MTRs will. The rims are too narrow for optimal > fit, but they work ok – the tall stiff sidewall makes the rim sizing > somewhat less critical. The HyperTech Power Programmer will, among other > neat things, allow you to calibrate the speed/odometer exactly for the > different tire height. > KeS
Response:
> Kevin: > Thanks for the info. > So you put Goodyear 285/75 tires on your stock 16×7 rims, without any type > of lift kit, and they fit with no rubbing, correct?
Yes, on a 2001 Tahoe. They were actually GMC rims of whatever they call the Silverado pickup (Sierra??), but they’re all the same size/offset. Let me hedge the "no rubbing" – on the Tahoe the inner fender is plastic, and very floppy – it isn’t attached solidly to anything. Under full articulation in offroad conditions, the Goodyear MTRs would occasionally pick up the edge of the inner fender, making a noise remarkably like a playing card in the spokes of a bicycle. I put a little swatch of duct tape on to hold the inner fender in place, and all was well. There was never any issue of rubbing in the normal sense, against the actual wheel well, torsion bar, or anything of that sort. >How do they look?
Like big ugly offroad tires. >How much height increase did you get?
1/2 of the difference in diameter between the OEM and replacement tires, of course. About 3/4 inch. > Also, what’s that "HyperTech Power Programmer"?
Check the web. It’s basically an engine power "chip", but instead of being an actual chip it plugs in and allows you to reprogram the ECM. A bit pricey at $300+, and I’m not convinced of any great power increases (I’ve used them on Camaros and Corvettes), but they do have some other virtues, particularly on the electronic auto transmission cars: – reprogram rev limiter – reprogram top speed limiter – adjust speed/odometer for changes in gearing and tire size – change all the shift points around on the electronic transmissions. KeS
Response:
I’ve done this on my 2001 Tahoe (same 16×7 rims). They will fit with no rubbing, at least Goodyear MTRs will. The rims are too narrow for optimal fit, but they work ok – the tall stiff sidewall makes the rim sizing somewhat less critical. The HyperTech Power Programmer will, among other neat things, allow you to calibrate the speed/odometer exactly for the different tire height. KeS – Hide quoted text — Show quoted text – > Nick: > Thanks for the info. The wheels that came with my Silverado are the > optional aluminum wheels that are required for the 265 tires, the Chevy > option code is "PF9". I assume these are the ones you say are 7" (I have no > way of measuring). I’m curious though about using these rims with 285 > tires. In the BFGoodrich info sheet, it says you need 7.5-9" rims for > 285/75 tires. So wouldn’t the PF9 rims be too narrow? > Ditto for the 6.5" rims on the Suburban. The BFGoodrich sheet says you need > 7-8" rims for 265/75 tires. Am I out of luck (assuming I didn’t want to buy > new rims)? > Jim > you can do both things you are planning on doing, but, the gm factory rims > that > come with the 265’s are 7" rims, 285’s need a 7.5" rim for ideal fitment, > but > they will fit the factory wheels. same goes for the sub with 245’s. the > 245 rims > are 6.5" and 265’s need 7". that being said, the 285 will work better on > the rim > that is a little narrower because they are taller [33" vs 31"] so there > is more > room for the side wall to come in on the rim. [the 285 will be happier on > a 7" > rim than a 265 on a 6.5" rim] as for the speedo, you’ll be off by about 4% > with > both, but gm speedos are usually wrong from the factory by 1-2% so the > tire > change will only make a 2-3% change in the speedo. just don’t drive faster > than > the limit, and you should never be going enough over to get a speeding > ticket. > on the z71, you may also need to tighten the torsion bars up a bit to stop > any > minor rubbing that could occur. on my 97 tahoe, i am running 285’s up > front and > they do not rub at all. they are on 16×8 rims with 5" backspacing. i > tightened > the torsion bars 1/2 a turn [not very much at all] and removed the bumper > fill > panels, and trimmed the trailing edge of the bumper by 1/2" at the bottom. > nick
Response:
16×8’s won’t work, at least not on the 2001 Tahoe, without a body lift. The 7 inch rims are narrow enough for the tires to tuck inside the wheelwells under compression. With the extra half inch offset of the 8 inch rims, they won’t. KeS – Hide quoted text — Show quoted text – > they are a bit too narrow, but they will work. i have seen some people with > 305/70/16’s mounted on the stock 16×7 wheels, when they need a 8" rim. what you > could do [assuming both the z71 and sub are 1/2 ton] you could get some steel or > alloy wheels for your z71 and put the 285’s on them, and just directly put the > z71 factory alloys on the sub. you can get steel wheels for [16x8's would work > good] for quite cheap ~ $50.00 for some black rockcrawler type rims from > national wheel & tire, $60 for chrome ones > Nick: > Thanks for the info. The wheels that came with my Silverado are the > optional aluminum wheels that are required for the 265 tires, the Chevy > option code is "PF9". I assume these are the ones you say are 7" (I have no > way of measuring). I’m curious though about using these rims with 285 > tires. In the BFGoodrich info sheet, it says you need 7.5-9" rims for > 285/75 tires. So wouldn’t the PF9 rims be too narrow? > Ditto for the 6.5" rims on the Suburban. The BFGoodrich sheet says you need > 7-8" rims for 265/75 tires. Am I out of luck (assuming I didn’t want to buy > new rims)? > Jim > > you can do both things you are planning on doing, but, the gm factory rims > that > > come with the 265’s are 7" rims, 285’s need a 7.5" rim for ideal fitment, > but > > they will fit the factory wheels. same goes for the sub with 245’s. the > 245 rims > > are 6.5" and 265’s need 7". that being said, the 285 will work better on > the rim > > that is a little narrower because they are taller [33" vs 31"] so there > is more > > room for the side wall to come in on the rim. [the 285 will be happier on > a 7" > > rim than a 265 on a 6.5" rim] as for the speedo, you’ll be off by about 4% > with > > both, but gm speedos are usually wrong from the factory by 1-2% so the > tire > > change will only make a 2-3% change in the speedo. just don’t drive faster > than > > the limit, and you should never be going enough over to get a speeding > ticket. > > on the z71, you may also need to tighten the torsion bars up a bit to stop > any > > minor rubbing that could occur. on my 97 tahoe, i am running 285’s up > front and > > they do not rub at all. they are on 16×8 rims with 5" backspacing. i > tightened > > the torsion bars 1/2 a turn [not very much at all] and removed the bumper > fill > > panels, and trimmed the trailing edge of the bumper by 1/2" at the bottom. > > nick
Response:
they are a bit too narrow, but they will work. i have seen some people with 305/70/16’s mounted on the stock 16×7 wheels, when they need a 8" rim. what you could do [assuming both the z71 and sub are 1/2 ton] you could get some steel or alloy wheels for your z71 and put the 285’s on them, and just directly put the z71 factory alloys on the sub. you can get steel wheels for [16x8's would work good] for quite cheap ~ $50.00 for some black rockcrawler type rims from national wheel & tire, $60 for chrome ones – Hide quoted text — Show quoted text – > Nick: > Thanks for the info. The wheels that came with my Silverado are the > optional aluminum wheels that are required for the 265 tires, the Chevy > option code is "PF9". I assume these are the ones you say are 7" (I have no > way of measuring). I’m curious though about using these rims with 285 > tires. In the BFGoodrich info sheet, it says you need 7.5-9" rims for > 285/75 tires. So wouldn’t the PF9 rims be too narrow? > Ditto for the 6.5" rims on the Suburban. The BFGoodrich sheet says you need > 7-8" rims for 265/75 tires. Am I out of luck (assuming I didn’t want to buy > new rims)? > Jim > you can do both things you are planning on doing, but, the gm factory rims > that > come with the 265’s are 7" rims, 285’s need a 7.5" rim for ideal fitment, > but > they will fit the factory wheels. same goes for the sub with 245’s. the > 245 rims > are 6.5" and 265’s need 7". that being said, the 285 will work better on > the rim > that is a little narrower because they are taller [33" vs 31"] so there > is more > room for the side wall to come in on the rim. [the 285 will be happier on > a 7" > rim than a 265 on a 6.5" rim] as for the speedo, you’ll be off by about 4% > with > both, but gm speedos are usually wrong from the factory by 1-2% so the > tire > change will only make a 2-3% change in the speedo. just don’t drive faster > than > the limit, and you should never be going enough over to get a speeding > ticket. > on the z71, you may also need to tighten the torsion bars up a bit to stop > any > minor rubbing that could occur. on my 97 tahoe, i am running 285’s up > front and > they do not rub at all. they are on 16×8 rims with 5" backspacing. i > tightened > the torsion bars 1/2 a turn [not very much at all] and removed the bumper > fill > panels, and trimmed the trailing edge of the bumper by 1/2" at the bottom. > nick
Response:
I just bought a 2001 Silverado Z71. It came with LT265/75R16 Firestone tires. I would like to switch to BFGoodrich All-Terrain T/A tires. I have two questions: 1) Can I go up in size to 285/75R16? Are there any negative effects, e.g. will my speedometer be off by a lot? 2) I have a ‘98 GMC Suburban that has some old LT245/75R16 tires. Can I put the 265/75R16 tires from my Silverado on the Suburban? Again, are there any negative effects or will they work fine on the Suburban? Thanks in advance for any advice.
Response:
you can do both things you are planning on doing, but, the gm factory rims that come with the 265’s are 7" rims, 285’s need a 7.5" rim for ideal fitment, but they will fit the factory wheels. same goes for the sub with 245’s. the 245 rims are 6.5" and 265’s need 7". that being said, the 285 will work better on the rim that is a little narrower because they are taller [33" vs 31"] so there is more room for the side wall to come in on the rim. [the 285 will be happier on a 7" rim than a 265 on a 6.5" rim] as for the speedo, you’ll be off by about 4% with both, but gm speedos are usually wrong from the factory by 1-2% so the tire change will only make a 2-3% change in the speedo. just don’t drive faster than the limit, and you should never be going enough over to get a speeding ticket. on the z71, you may also need to tighten the torsion bars up a bit to stop any minor rubbing that could occur. on my 97 tahoe, i am running 285’s up front and they do not rub at all. they are on 16×8 rims with 5" backspacing. i tightened the torsion bars 1/2 a turn [not very much at all] and removed the bumper fill panels, and trimmed the trailing edge of the bumper by 1/2" at the bottom. nick – Hide quoted text — Show quoted text – > I just bought a 2001 Silverado Z71. It came with LT265/75R16 Firestone > tires. I would like to switch to BFGoodrich All-Terrain T/A tires. I have > two questions: > 1) Can I go up in size to 285/75R16? Are there any negative effects, e.g. > will my speedometer be off by a lot? > 2) I have a ‘98 GMC Suburban that has some old LT245/75R16 tires. Can I put > the 265/75R16 tires from my Silverado on the Suburban? Again, are there any > negative effects or will they work fine on the Suburban? > Thanks in advance for any advice.
Response:
Nick: Thanks for the info. The wheels that came with my Silverado are the optional aluminum wheels that are required for the 265 tires, the Chevy option code is "PF9". I assume these are the ones you say are 7" (I have no way of measuring). I’m curious though about using these rims with 285 tires. In the BFGoodrich info sheet, it says you need 7.5-9" rims for 285/75 tires. So wouldn’t the PF9 rims be too narrow? Ditto for the 6.5" rims on the Suburban. The BFGoodrich sheet says you need 7-8" rims for 265/75 tires. Am I out of luck (assuming I didn’t want to buy new rims)? Jim
– Hide quoted text — Show quoted text -> you can do both things you are planning on doing, but, the gm factory rims that > come with the 265’s are 7" rims, 285’s need a 7.5" rim for ideal fitment, but > they will fit the factory wheels. same goes for the sub with 245’s. the 245 rims > are 6.5" and 265’s need 7". that being said, the 285 will work better on the rim > that is a little narrower because they are taller [33" vs 31"] so there is more > room for the side wall to come in on the rim. [the 285 will be happier on a 7" > rim than a 265 on a 6.5" rim] as for the speedo, you’ll be off by about 4% with > both, but gm speedos are usually wrong from the factory by 1-2% so the tire > change will only make a 2-3% change in the speedo. just don’t drive faster than > the limit, and you should never be going enough over to get a speeding ticket. > on the z71, you may also need to tighten the torsion bars up a bit to stop any > minor rubbing that could occur. on my 97 tahoe, i am running 285’s up front and > they do not rub at all. they are on 16×8 rims with 5" backspacing. i tightened > the torsion bars 1/2 a turn [not very much at all] and removed the bumper fill > panels, and trimmed the trailing edge of the bumper by 1/2" at the bottom. > nick
Response:
Good response, but measured across the face from edge to edge; I don’t think so!!!! You forgot about the LIP.
– Hide quoted text — Show quoted text -> When buying new tires, let’s say I was buying 18 inch tires, where is the 18 > inches measured from? The diameter of the wheel from the top of the rims to > the bottom, or does it measure the diameter from the top of the tire (from > the side) to the bottom? If its the top of the rim to the bottom, then a > tire which is 225/40/18 would be bigger than a tire which is 225/25/18, > despite both being 18 inch tires, but the former having a bigger sidewall. > Sorta. WHEELS are measured in INCHES, i.e. 18" wheel is obviously 18" >across the face from edge to edge. Now tires are a little different. One, >obviously they are measured in millimeters and percentages. example ~ >225/40-18 means 225mm across at the tires WIDEST point, NOT tread width, the >40 means the SIDEWALL’S heighth in millimeters is 40% the total width of the >tire (90 millimeters in this case) and the 18 of course means what size the >wheel the tire is meant to go on. >there is a formula to determine the correct size tire for your car ~ not going >to explain WHY, but you should never vary the tire size more than 1/2"!! this >is within treadwear and is very important to stay in that size range on newer >cars. > RIGHT IT DOWN! ~ MOST of the tire shop guys I meet have never even seen this >formula! >the formula is HIGHTH x WIDTH x 2 / 25.4 + wheel diameter = rolling diameter > 225/40-18 = = 225 x .40 x 2 / 25.4 + 18 = 25.086 inches >hope that helps >windowtint >– >The tinting professionals >question and answer forum
Response:
Eh, I stand corrected, I misspoke or didn’t speak clear enough I guess, I assume none the less though most people will be able to figure out what size rim the are runnin’ on (if not, you should have your drivers liscence yanked!) windowtint > Good response, but measured across the face from edge to edge; I don’t think > so!!!! You forgot about the LIP.
– The tinting professionals question and answer forum
Response:
> When buying new tires, let’s say I was buying 18 inch tires, where is the 18 > inches measured from? The diameter of the wheel from the top of the rims to > the bottom, or does it measure the diameter from the top of the tire (from > the side) to the bottom? If its the top of the rim to the bottom, then a > tire which is 225/40/18 would be bigger than a tire which is 225/25/18, > despite both being 18 inch tires, but the former having a bigger sidewall.
Sorta. WHEELS are measured in INCHES, i.e. 18" wheel is obviously 18" across the face from edge to edge. Now tires are a little different. One, obviously they are measured in millimeters and percentages. example ~ 225/40-18 means 225mm across at the tires WIDEST point, NOT tread width, the 40 means the SIDEWALL’S heighth in millimeters is 40% the total width of the tire (90 millimeters in this case) and the 18 of course means what size the wheel the tire is meant to go on. there is a formula to determine the correct size tire for your car ~ not going to explain WHY, but you should never vary the tire size more than 1/2"!! this is within treadwear and is very important to stay in that size range on newer cars. RIGHT IT DOWN! ~ MOST of the tire shop guys I meet have never even seen this formula! the formula is HIGHTH x WIDTH x 2 / 25.4 + wheel diameter = rolling diameter 225/40-18 = = 225 x .40 x 2 / 25.4 + 18 = 25.086 inches hope that helps windowtint — The tinting professionals question and answer forum
Response:
It is the inside diameter of the tire matched to the inside diameter of the wheel, not including the height of its flange. – Hide quoted text — Show quoted text – >When buying new tires, let’s say I was buying 18 inch tires, where is the 18 >inches measured from? The diameter of the wheel from the top of the rims to >the bottom, or does it measure the diameter from the top of the tire (from >the side) to the bottom? If its the top of the rim to the bottom, then a >tire which is 225/40/18 would be bigger than a tire which is 225/25/18, >despite both being 18 inch tires, but the former having a bigger sidewall.
Response:
When buying new tires, let’s say I was buying 18 inch tires, where is the 18 inches measured from? The diameter of the wheel from the top of the rims to the bottom, or does it measure the diameter from the top of the tire (from the side) to the bottom? If its the top of the rim to the bottom, then a tire which is 225/40/18 would be bigger than a tire which is 225/25/18, despite both being 18 inch tires, but the former having a bigger sidewall.
Response:
> 195/65/14 will be a match to within 1%. Go play around with the great gadget at > http://mr2.com/cgi-bin/tires.cgi to see what else you can put on there.
You mean http://mr2.com/FORMS/tire.html Ya gotta ask the question BEFORE you get the answer!
Response:
If you go with 195/65 this will give you a much better ride. You will get more grip and the speed is hardly changed. And if you have you have an EX go with H rated not S. Good luck
Response:
An EX had 15 inch wheels and 195/60 15 inch tires. Going from a 70 series tire to a wider aspect ratio has an adverse impact on ride, tightens turn in to enhance the feed back in turning and, all things being equal, increase dry traction and decrease water, ice and snow traction. 65 and 60 series street tires are a good compromise with little to be gained from increase aspect ratios.
– Hide quoted text — Show quoted text -> If you go with 195/65 this will give you a much better ride. You will get more > grip and the speed is hardly changed. And if you have you have an EX go with H > rated not S. Good luck
Response:
>Hi all, >I am about to change all 4 tires on my 94 Accord. The recommended size >is 185/70/14, S rating, with 32kP pressure. >Here is the question: aside from manufacturer’s specs, would I be able >to use a wider tire (195 or 205) for a better ride? Would a wider tire >give me a better ride all together? I know I have to match the tire >height to make it equivalent to 185/70 for speedometer purposes, but if >I want to live with speedometer variations, am I better off going to, >say, 195/60 instead of 185/70?
Wider tires wil; not give you a better ride per say. And even if they did, you need to be carefull to get a tire that is still compatible with your wheel width (I expect 195’s will, but 205’s might not). What you may want to do and what will probably give you the best results would be to try and find the best tire (brand/model) for what you want and get it in your tire size, rather than to try and adjust the tire size to get what you want.
Response:
195/65/14 will be a match to within 1%. Go play around with the great gadget at http://mr2.com/cgi-bin/tires.cgi to see what else you can put on there. – Hide quoted text — Show quoted text – > Hi all, > I am about to change all 4 tires on my 94 Accord. The recommended size > is 185/70/14, S rating, with 32kP pressure. > Here is the question: aside from manufacturer’s specs, would I be able > to use a wider tire (195 or 205) for a better ride? Would a wider tire > give me a better ride all together? I know I have to match the tire > height to make it equivalent to 185/70 for speedometer purposes, but if > I want to live with speedometer variations, am I better off going to, > say, 195/60 instead of 185/70? > Thanks in advance, > Fazel
Response:
[ Attached Message ]
To: Local:
Tire size question Hi all, I am about to change all 4 tires on my 94 Accord. The recommended size is 185/70/14, S rating, with 32kP pressure. Here is the question: aside from manufacturer’s specs, would I be able to use a wider tire (195 or 205) for a better ride? Would a wider tire give me a better ride all together? I know I have to match the tire height to make it equivalent to 185/70 for speedometer purposes, but if I want to live with speedometer variations, am I better off going to, say, 195/60 instead of 185/70? Thanks in advance, Fazel
Response:
Good response, but measured across the face from edge to edge; I don’t think so!!!! You forgot about the LIP.
– Hide quoted text — Show quoted text -> When buying new tires, let’s say I was buying 18 inch tires, where is the 18 > inches measured from? The diameter of the wheel from the top of the rims to > the bottom, or does it measure the diameter from the top of the tire (from > the side) to the bottom? If its the top of the rim to the bottom, then a > tire which is 225/40/18 would be bigger than a tire which is 225/25/18, > despite both being 18 inch tires, but the former having a bigger sidewall. > Sorta. WHEELS are measured in INCHES, i.e. 18" wheel is obviously 18" >across the face from edge to edge. Now tires are a little different. One, >obviously they are measured in millimeters and percentages. example ~ >225/40-18 means 225mm across at the tires WIDEST point, NOT tread width, the >40 means the SIDEWALL’S heighth in millimeters is 40% the total width of the >tire (90 millimeters in this case) and the 18 of course means what size the >wheel the tire is meant to go on. >there is a formula to determine the correct size tire for your car ~ not going >to explain WHY, but you should never vary the tire size more than 1/2"!! this >is within treadwear and is very important to stay in that size range on newer >cars. > RIGHT IT DOWN! ~ MOST of the tire shop guys I meet have never even seen this >formula! >the formula is HIGHTH x WIDTH x 2 / 25.4 + wheel diameter = rolling diameter > 225/40-18 = = 225 x .40 x 2 / 25.4 + 18 = 25.086 inches >hope that helps >windowtint >– >The tinting professionals >question and answer forum
Response:
Eh, I stand corrected, I misspoke or didn’t speak clear enough I guess, I assume none the less though most people will be able to figure out what size rim the are runnin’ on (if not, you should have your drivers liscence yanked!) windowtint > Good response, but measured across the face from edge to edge; I don’t think > so!!!! You forgot about the LIP.
– The tinting professionals question and answer forum
Response:
> When buying new tires, let’s say I was buying 18 inch tires, where is the 18 > inches measured from? The diameter of the wheel from the top of the rims to > the bottom, or does it measure the diameter from the top of the tire (from > the side) to the bottom? If its the top of the rim to the bottom, then a > tire which is 225/40/18 would be bigger than a tire which is 225/25/18, > despite both being 18 inch tires, but the former having a bigger sidewall.
Sorta. WHEELS are measured in INCHES, i.e. 18" wheel is obviously 18" across the face from edge to edge. Now tires are a little different. One, obviously they are measured in millimeters and percentages. example ~ 225/40-18 means 225mm across at the tires WIDEST point, NOT tread width, the 40 means the SIDEWALL’S heighth in millimeters is 40% the total width of the tire (90 millimeters in this case) and the 18 of course means what size the wheel the tire is meant to go on. there is a formula to determine the correct size tire for your car ~ not going to explain WHY, but you should never vary the tire size more than 1/2"!! this is within treadwear and is very important to stay in that size range on newer cars. RIGHT IT DOWN! ~ MOST of the tire shop guys I meet have never even seen this formula! the formula is HIGHTH x WIDTH x 2 / 25.4 + wheel diameter = rolling diameter 225/40-18 = = 225 x .40 x 2 / 25.4 + 18 = 25.086 inches hope that helps windowtint — The tinting professionals question and answer forum
Response:
It is the inside diameter of the tire matched to the inside diameter of the wheel, not including the height of its flange. – Hide quoted text — Show quoted text – >When buying new tires, let’s say I was buying 18 inch tires, where is the 18 >inches measured from? The diameter of the wheel from the top of the rims to >the bottom, or does it measure the diameter from the top of the tire (from >the side) to the bottom? If its the top of the rim to the bottom, then a >tire which is 225/40/18 would be bigger than a tire which is 225/25/18, >despite both being 18 inch tires, but the former having a bigger sidewall.
Response:
When buying new tires, let’s say I was buying 18 inch tires, where is the 18 inches measured from? The diameter of the wheel from the top of the rims to the bottom, or does it measure the diameter from the top of the tire (from the side) to the bottom? If its the top of the rim to the bottom, then a tire which is 225/40/18 would be bigger than a tire which is 225/25/18, despite both being 18 inch tires, but the former having a bigger sidewall.
Response:
> 195/65/14 will be a match to within 1%. Go play around with the great gadget at > http://mr2.com/cgi-bin/tires.cgi to see what else you can put on there.
You mean http://mr2.com/FORMS/tire.html Ya gotta ask the question BEFORE you get the answer!
Response:
If you go with 195/65 this will give you a much better ride. You will get more grip and the speed is hardly changed. And if you have you have an EX go with H rated not S. Good luck
Response:
An EX had 15 inch wheels and 195/60 15 inch tires. Going from a 70 series tire to a wider aspect ratio has an adverse impact on ride, tightens turn in to enhance the feed back in turning and, all things being equal, increase dry traction and decrease water, ice and snow traction. 65 and 60 series street tires are a good compromise with little to be gained from increase aspect ratios.
– Hide quoted text — Show quoted text -> If you go with 195/65 this will give you a much better ride. You will get more > grip and the speed is hardly changed. And if you have you have an EX go with H > rated not S. Good luck
Response:
>Hi all, >I am about to change all 4 tires on my 94 Accord. The recommended size >is 185/70/14, S rating, with 32kP pressure. >Here is the question: aside from manufacturer’s specs, would I be able >to use a wider tire (195 or 205) for a better ride? Would a wider tire >give me a better ride all together? I know I have to match the tire >height to make it equivalent to 185/70 for speedometer purposes, but if >I want to live with speedometer variations, am I better off going to, >say, 195/60 instead of 185/70?
Wider tires wil; not give you a better ride per say. And even if they did, you need to be carefull to get a tire that is still compatible with your wheel width (I expect 195’s will, but 205’s might not). What you may want to do and what will probably give you the best results would be to try and find the best tire (brand/model) for what you want and get it in your tire size, rather than to try and adjust the tire size to get what you want.
Response:
195/65/14 will be a match to within 1%. Go play around with the great gadget at http://mr2.com/cgi-bin/tires.cgi to see what else you can put on there. – Hide quoted text — Show quoted text – > Hi all, > I am about to change all 4 tires on my 94 Accord. The recommended size > is 185/70/14, S rating, with 32kP pressure. > Here is the question: aside from manufacturer’s specs, would I be able > to use a wider tire (195 or 205) for a better ride? Would a wider tire > give me a better ride all together? I know I have to match the tire > height to make it equivalent to 185/70 for speedometer purposes, but if > I want to live with speedometer variations, am I better off going to, > say, 195/60 instead of 185/70? > Thanks in advance, > Fazel
Response:
[ Attached Message ]
To: Local:
Tire size question Hi all, I am about to change all 4 tires on my 94 Accord. The recommended size is 185/70/14, S rating, with 32kP pressure. Here is the question: aside from manufacturer’s specs, would I be able to use a wider tire (195 or 205) for a better ride? Would a wider tire give me a better ride all together? I know I have to match the tire height to make it equivalent to 185/70 for speedometer purposes, but if I want to live with speedometer variations, am I better off going to, say, 195/60 instead of 185/70? Thanks in advance, Fazel
