whats the deal on the tire sizes??
Question:
Derek, You SHOULDN’T be able to lock up the tires….That’s what the ABS is there for….to PREVENT lockup. As for the tire size screwing up the ABS it won’t if all 4 tires are the same size. The ABS measures the difference in speed(rotation) between all tires to see if any are locking up. Then it releases the pressure to the lockup wheel and prevents skidding, this way you keep directional control of the vehicle. Back to the tires size question. Remember the 2xx by yy by zz is a relationship. Example 285 by 75 by 16 is a tire for a 16" rim. The 75 means the cross sectional height is 75 Percent as high as it is wide. the 285 is the width in millimeters. Therefore 285mm=11.11"(approx) and 75% of that is 8.33". Then we can see on a 16" rim the tire diameter is about 32" tall. If you go to a higher aspect ratio tire it becomes taller, so an 85 Series tire is taller then a 60 Series tire. As for how a tire will wear if it’s on the wrong width rim depends on how far off you are. I have factory rims on my 89′ GMC Jimmy(V1500) the largest tires from the factory were 31" 15’s, I tried 32’s and finally 33X12.50’s and have NO abnormal wear. I get 60K average on the tires since new and now have 340K on the truck. I have used Goodyear, Dunlop and Sears brands, run at 28PSI all year round. Some shops would not put the 33’s on my rims even when they could see there were REPLACING 33’s already mounted that had a perfectly normal wear pattern. I agree there is maybe more flexing of the sidewalls this way but there are no problems through 4 sets of these except the normal edge wear on the fronts due to the solid axle on an 89′. But I rotate them front to rear to even them out. Your speedometer will be off soon as you change the tire diameter. On newer vehicles you can reset the computer. I had to replace the driven gear on the speedometer drive to get it back on track. Not sure about the torsion bar remedy either. It probably will cause the camber setting to change so you’ll need to realign the truck. – Hide quoted text — Show quoted text -> I was going to go with 285′2 on my truck too, until I found out the anti > locks would not read right as I would be out of range for the > computer….and the others have noticed the mileage and speedo probs…. >Ahh, damn, forgot that one. Yes the ABS is worthless when the bigger >tires get put on. I almost flattened the neighbor cause that damn >tires would not lock up. I did finally convince the dealer to flash >the prom for free. $60 normally. Speedo is back to normal, ABS is >still garbage but not any worse than before the tire upgrade and the >trans seems to shift fine also. As for mileage, I don’t really care. >I get 19 at steady 60 mph cruising, get about 15 highway/city and get >11-12 city only. Don’t know how that compares with a stocker (I >upgraded immediately), but as long as I get more than 10 I am happy. >Someone posted about the programmers. I have never used one and for >$300, that is the reason why. Plus I am not too keen on advancing my >timing, introducing engine knock and burning holes in pistons for an >extra 5hp.
http://www.newsfeed.com The #1 Newsgroup Service in the World! —–= Over 100,000 Newsgroups – Unlimited Fast Downloads – 19 Servers =—–
Response:
Here is a trick I heard about. Put your new tires on. Then overinflate them. Then drive over a piece of paper. Take a look at your track. If it’s not the full contact width of the tread, let out some air. Then do it again until you reach the PSI that just has your tire provide full contact and treadwidth on the paper. That should give you an accurate running PSI for your rig and new tire size. This reminds me. I need to do the same thing for my new larger tires. Anybody have a reason this won’t work? It’s sure as heck simple! – Hide quoted text — Show quoted text -> ok, so i have read a tonne of posts about what sizes of tires that i > could fit onto my stock chev rims. i have a 2000 chev silverado reg > cab short box z71, with a 4.8 in it. now it came with a set of > garbage firestones wilderness’ on it, they r 265/75/16, and im lookin > to go to a 285/75/16. the problem that i run into is, i have read both > pros and cons to doing this, for example; i have read that the tire > will fit fin with minimal rubbing, and i have read that the tire is to > big for the stock rim that is 7" wide, and that i need to goto a wider > rim. and i dont want to, i like the stock rims. so i called a > commercial tire provider and asked what i could do. he said that the > 285’s r to big, unless someone knows what tire pressure to put in them > so that the whole tread will wear evenly, instead of just in the > middle. so if anyone could help me solve my problem here, it would be > great, because i do want to goto a bigger tires but i want to keep the > stock rims. and im sure that many other ppl would like to know what > the deal is about this situation too!!!, oh ya, i want to goto the > BFGoodrich Mud-Terrains, what a beautiful tire!!! > thanx alot > jjcarron > 2000 Silverado Reg Cab Sort Box Z71 4.8
Response:
> I was going to go with 285′2 on my truck too, until I found out the anti > locks would not read right as I would be out of range for the > computer….and the others have noticed the mileage and speedo probs….
Ahh, damn, forgot that one. Yes the ABS is worthless when the bigger tires get put on. I almost flattened the neighbor cause that damn tires would not lock up. I did finally convince the dealer to flash the prom for free. $60 normally. Speedo is back to normal, ABS is still garbage but not any worse than before the tire upgrade and the trans seems to shift fine also. As for mileage, I don’t really care. I get 19 at steady 60 mph cruising, get about 15 highway/city and get 11-12 city only. Don’t know how that compares with a stocker (I upgraded immediately), but as long as I get more than 10 I am happy. Someone posted about the programmers. I have never used one and for $300, that is the reason why. Plus I am not too keen on advancing my timing, introducing engine knock and burning holes in pistons for an extra 5hp.
Response:
Would this be a good reason to purchase a hypertek power programmer? Apparently they allow you to adjust the computer for different tire sizes. I have also heard that the dealership can do something to the computer to adjust for different tire sizes. Anyway know about this, and how much they would charge? Is it worth it? I need new tires myself right now for winter, and I wanted to go with BFG AT KO’s 285/75/16. The local tire guy said they would be OK for size, but he never mentioned anything about speedo problems, etc.
– Hide quoted text — Show quoted text -> I was going to go with 285′2 on my truck too, until I found out the anti > locks would not read right as I would be out of range for the > computer….and the others have noticed the mileage and speedo probs…. > > ok, so i have read a tonne of posts about what sizes of tires that i > > could fit onto my stock chev rims. i have a 2000 chev silverado reg > > cab short box z71, with a 4.8 in it. now it came with a set of > > garbage firestones wilderness’ on it, they r 265/75/16, and im lookin > > to go to a 285/75/16. the problem that i run into is, i have read both > > pros and cons to doing this, for example; i have read that the tire > > will fit fin with minimal rubbing, and i have read that the tire is to > > big for the stock rim that is 7" wide, and that i need to goto a wider > > rim. and i dont want to, i like the stock rims. so i called a > > commercial tire provider and asked what i could do. he said that the > > 285’s r to big, unless someone knows what tire pressure to put in them > > so that the whole tread will wear evenly, instead of just in the > > middle. so if anyone could help me solve my problem here, it would be > > great, because i do want to goto a bigger tires but i want to keep the > > stock rims. and im sure that many other ppl would like to know what > > the deal is about this situation too!!!, oh ya, i want to goto the > > BFGoodrich Mud-Terrains, what a beautiful tire!!! > I have a 2000 extended cab 1500 Z71 w/ 5.3L and 285/75/R16 BFG ATs. I > experience almost no rubbing except when in reverse, bed loaded, > wheels cranked to the right, backing out of driveway at the very > bottom when the tire gets stuffed into the wheel well. A little > trimming 1" X 3" in the inner fender flap removed the rubbing. Even > full stuff off road loaded, they will not rub. I would definitely > stay away from the BFG ATs. Garbage in my opinion. Every blowout I > ever had was on those tires and every one of them did at least $1K in > body damage. I run my tires at about 35 PSI and they seem to wear OK > and I am using the stock 16" rims. I will replace these with either > pro comp or BFG MTs. There is a pic on my dire need of repair website > on the home page. > www.woopies.net > You can always crank up the torsion bars 1/2" inch or so if there is > any rubbing. I have not done this, but some guys lurking here have > and they have had no ill effects. > Derek
Response:
I was going to go with 285′2 on my truck too, until I found out the anti locks would not read right as I would be out of range for the computer….and the others have noticed the mileage and speedo probs….
– Hide quoted text — Show quoted text -> ok, so i have read a tonne of posts about what sizes of tires that i > could fit onto my stock chev rims. i have a 2000 chev silverado reg > cab short box z71, with a 4.8 in it. now it came with a set of > garbage firestones wilderness’ on it, they r 265/75/16, and im lookin > to go to a 285/75/16. the problem that i run into is, i have read both > pros and cons to doing this, for example; i have read that the tire > will fit fin with minimal rubbing, and i have read that the tire is to > big for the stock rim that is 7" wide, and that i need to goto a wider > rim. and i dont want to, i like the stock rims. so i called a > commercial tire provider and asked what i could do. he said that the > 285’s r to big, unless someone knows what tire pressure to put in them > so that the whole tread will wear evenly, instead of just in the > middle. so if anyone could help me solve my problem here, it would be > great, because i do want to goto a bigger tires but i want to keep the > stock rims. and im sure that many other ppl would like to know what > the deal is about this situation too!!!, oh ya, i want to goto the > BFGoodrich Mud-Terrains, what a beautiful tire!!! > I have a 2000 extended cab 1500 Z71 w/ 5.3L and 285/75/R16 BFG ATs. I > experience almost no rubbing except when in reverse, bed loaded, > wheels cranked to the right, backing out of driveway at the very > bottom when the tire gets stuffed into the wheel well. A little > trimming 1" X 3" in the inner fender flap removed the rubbing. Even > full stuff off road loaded, they will not rub. I would definitely > stay away from the BFG ATs. Garbage in my opinion. Every blowout I > ever had was on those tires and every one of them did at least $1K in > body damage. I run my tires at about 35 PSI and they seem to wear OK > and I am using the stock 16" rims. I will replace these with either > pro comp or BFG MTs. There is a pic on my dire need of repair website > on the home page. > www.woopies.net > You can always crank up the torsion bars 1/2" inch or so if there is > any rubbing. I have not done this, but some guys lurking here have > and they have had no ill effects. > Derek
Response:
- Hide quoted text — Show quoted text – > ok, so i have read a tonne of posts about what sizes of tires that i > could fit onto my stock chev rims. i have a 2000 chev silverado reg > cab short box z71, with a 4.8 in it. now it came with a set of > garbage firestones wilderness’ on it, they r 265/75/16, and im lookin > to go to a 285/75/16. the problem that i run into is, i have read both > pros and cons to doing this, for example; i have read that the tire > will fit fin with minimal rubbing, and i have read that the tire is to > big for the stock rim that is 7" wide, and that i need to goto a wider > rim. and i dont want to, i like the stock rims. so i called a > commercial tire provider and asked what i could do. he said that the > 285’s r to big, unless someone knows what tire pressure to put in them > so that the whole tread will wear evenly, instead of just in the > middle. so if anyone could help me solve my problem here, it would be > great, because i do want to goto a bigger tires but i want to keep the > stock rims. and im sure that many other ppl would like to know what > the deal is about this situation too!!!, oh ya, i want to goto the > BFGoodrich Mud-Terrains, what a beautiful tire!!!
I have a 2000 extended cab 1500 Z71 w/ 5.3L and 285/75/R16 BFG ATs. I experience almost no rubbing except when in reverse, bed loaded, wheels cranked to the right, backing out of driveway at the very bottom when the tire gets stuffed into the wheel well. A little trimming 1" X 3" in the inner fender flap removed the rubbing. Even full stuff off road loaded, they will not rub. I would definitely stay away from the BFG ATs. Garbage in my opinion. Every blowout I ever had was on those tires and every one of them did at least $1K in body damage. I run my tires at about 35 PSI and they seem to wear OK and I am using the stock 16" rims. I will replace these with either pro comp or BFG MTs. There is a pic on my dire need of repair website on the home page. www.woopies.net You can always crank up the torsion bars 1/2" inch or so if there is any rubbing. I have not done this, but some guys lurking here have and they have had no ill effects. Derek
Response:
i have a buddy with a 2002 z and he has the 285’s (goodyears). as far as i know he hasn’t had any rubbing problems. i know he hasn’t done any serious off-roading, but he hasn’t mentioned any problems with them. oh, and he has the stock wheels. ya may want to get some more opinions but i hope that helps! – Hide quoted text — Show quoted text – > ok, so i have read a tonne of posts about what sizes of tires that i > could fit onto my stock chev rims. i have a 2000 chev silverado reg > cab short box z71, with a 4.8 in it. now it came with a set of > garbage firestones wilderness’ on it, they r 265/75/16, and im lookin > to go to a 285/75/16. the problem that i run into is, i have read both > pros and cons to doing this, for example; i have read that the tire > will fit fin with minimal rubbing, and i have read that the tire is to > big for the stock rim that is 7" wide, and that i need to goto a wider > rim. and i dont want to, i like the stock rims. so i called a > commercial tire provider and asked what i could do. he said that the > 285’s r to big, unless someone knows what tire pressure to put in them > so that the whole tread will wear evenly, instead of just in the > middle. so if anyone could help me solve my problem here, it would be > great, because i do want to goto a bigger tires but i want to keep the > stock rims. and im sure that many other ppl would like to know what > the deal is about this situation too!!!, oh ya, i want to goto the > BFGoodrich Mud-Terrains, what a beautiful tire!!! > thanx alot > jjcarron > 2000 Silverado Reg Cab Sort Box Z71 4.8
Response:
I put on some Futura Dakotas 285/75/16 (up from 265) on my stock suspension 1990 z71 about 2 months ago. So far I’ve had no rubbing, even on tight turns, and the times I’ve been offroad haven’t caused any rubbing either. Though I’ll admit the offroad trips have been fairly tame. I like how they fill the wheel wells a bit more, and have a more aggressive look. I noticed the truck is a tad more sluggish, the speedo is off a bit, and my gas mileage dropped, but none of these changes have been drastic. I was comparing some same brand and size mud vs. all terrain tires and noticed that some mud tires are a little wider and taller due to the tread pattern, so mud tires might rub. good luck. – Hide quoted text — Show quoted text – > ok, so i have read a tonne of posts about what sizes of tires that i > could fit onto my stock chev rims. i have a 2000 chev silverado reg > cab short box z71, with a 4.8 in it. now it came with a set of > garbage firestones wilderness’ on it, they r 265/75/16, and im lookin > to go to a 285/75/16. the problem that i run into is, i have read both > pros and cons to doing this, for example; i have read that the tire > will fit fin with minimal rubbing, and i have read that the tire is to > big for the stock rim that is 7" wide, and that i need to goto a wider > rim. and i dont want to, i like the stock rims. so i called a > commercial tire provider and asked what i could do. he said that the > 285’s r to big, unless someone knows what tire pressure to put in them > so that the whole tread will wear evenly, instead of just in the > middle. so if anyone could help me solve my problem here, it would be > great, because i do want to goto a bigger tires but i want to keep the > stock rims. and im sure that many other ppl would like to know what > the deal is about this situation too!!!, oh ya, i want to goto the > BFGoodrich Mud-Terrains, what a beautiful tire!!! > thanx alot > jjcarron > 2000 Silverado Reg Cab Sort Box Z71 4.8
– ‘88 Honda CBR600F ‘90 Chevy Z71 Sportside MSN: Tzihuac
Response:
ok, so i have read a tonne of posts about what sizes of tires that i could fit onto my stock chev rims. i have a 2000 chev silverado reg cab short box z71, with a 4.8 in it. now it came with a set of garbage firestones wilderness’ on it, they r 265/75/16, and im lookin to go to a 285/75/16. the problem that i run into is, i have read both pros and cons to doing this, for example; i have read that the tire will fit fin with minimal rubbing, and i have read that the tire is to big for the stock rim that is 7" wide, and that i need to goto a wider rim. and i dont want to, i like the stock rims. so i called a commercial tire provider and asked what i could do. he said that the 285’s r to big, unless someone knows what tire pressure to put in them so that the whole tread will wear evenly, instead of just in the middle. so if anyone could help me solve my problem here, it would be great, because i do want to goto a bigger tires but i want to keep the stock rims. and im sure that many other ppl would like to know what the deal is about this situation too!!!, oh ya, i want to goto the BFGoodrich Mud-Terrains, what a beautiful tire!!! thanx alot jjcarron 2000 Silverado Reg Cab Sort Box Z71 4.8
