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Size of Tire Question

  #1  
Old 07-14-2009, 01:04 AM
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Default Size of Tire Question

I have a 1999 2dr 4x4 Chev Blazer (not zr2). Right now I think it has 235 r15s on it. I have read posts in threads here that state with a 2 inch lift you can fit 265r15s with minimal trimming involved. I don't have a 2 inch lift but I have cranked my torsion bars way up. I will likely buy this new Duratrak tire from Goodyear. Will I be able to fit a 265 or only a 255?

Also, what difference in height will my Blazer have with 265s on as opposed to 255s...and between the 265 and 235's as well.
 
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Old 07-14-2009, 02:04 AM
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235,255, and 265 are section widths to know the overall diameter of the tire youll need to know the sidewall height such as 235/70/15 or 235/75/15. if you goal is to fit 31" tires youll need atleast 2" of lift, if you just crank your tbars like you did youll have to trim. if you want to compare tire sizes just google "tire size calculator" and youll find plenty of usefull links.
 
  #3  
Old 07-14-2009, 09:51 PM
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Thanks, I did a search as you suggested and went to the site
http://www.miata.net/garage/tirecalc.html

I put in 235/70/r15 as the stock size and then put in a bunch of variables. To avoid rubbing/trimming I will avoid going the 265 route...or the goal of 31s. When I entered a 265/70/r15 I only gained .3 of an inch on the radius (.3 more sidewall) of the tire over a 255/70/r15 anyway.

Can I go to a 255/75/r15 with my current set up (just t-bar cranks)? I found I would gain about 1 inches of radius (probably translates to 1 inch of lift I guess) on my Blazer if I went with a 255/75/r15. Seems like a lot of money to spend on tires just for one silly inch.
 
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Old 07-14-2009, 10:00 PM
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the 255/75/15 is roughly 30" so youll be able to run tires that size without any problems.
 
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Old 07-14-2009, 10:07 PM
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So how big can I go with the diameter on a 15 inch rim? 75 will work...will 80? 85? If I get a bigger sidewall is there a possibility of it looking stupid?

Is a 30X9.5R15 the same thing as a 255/75/r15?

Looks like Goodyear doesn't make the duratrak in a 255/75/r15 anyway...so now I don't know what to do.
 

Last edited by Heffty; 07-14-2009 at 10:19 PM.
  #6  
Old 07-14-2009, 10:18 PM
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if you want to run a bigger tire youll either have to lift or trim the 255/75/15 is about the biggest you can run without trimming, so if you decide to lift or trim you can run a bigger tire and how itll look on a 15" rim is just a matter of personal opinion some may like it and others wont. ive seen 34's on 15" rims and they looked just fine IMO.
 
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Old 07-14-2009, 10:36 PM
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Sorry, I edited my post there and added this question...

Is a 30X9.5R15 the same thing as a 255/75/r15?
 
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Old 07-14-2009, 11:00 PM
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the 255/75/15 is about .5" wider.
 
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Old 07-15-2009, 12:05 AM
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Problem solved - DuraTracs only come in a 235 75r15, 31X10.50 on 15, and 33X12.50 on 15.

I can tell you they fit bigger than any other 235 75r15s. I think they take the measurement from median wear - or the tire at half tread consumed thus bringing an average radius into play.

P.S. Be carefull tweaking those T-Bars... Unless you like to do heavy duty front suspension work and replace parts a lot, I would back them down to 19" Center of hub to the edge of the fender at the 12:00 position. Besides, you don't want the front end higher than the rear!?! Also, don't forget the re-aim your headlights so you don't blind granny on the way home from her bingo game!
 
  #10  
Old 07-15-2009, 08:34 PM
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There aren't a lot of tires at the 255/75/r15 size. I see the BF and Firestone Mud Terrain tires at the 30X9.5R15 but perhaps I should just settle for the 235/75/r15 Goodyear Duratraks. What do you guys think?
 

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