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Wheel backspacing and offset

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Old 06-25-2011, 11:53 PM
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Default Wheel backspacing and offset

I just got a 95 S10 Blazer 4x4. Im putting a 3" torsion bar key set and a 2.5"-3" add a leaf kit on it. I got both of em for $111 on ebay by the way. I want to put 31x10.50's on it but im not sure what kind of backspacing and offset I would need for the wider tire. I asked Cragar's customer service but they haven't answered. Any help would be greatly appreciated.
 
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Old 06-26-2011, 08:09 PM
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Could you go with less offset to move the centerline out? Im afraid I dont know enough about tire tech to figure this on out.
 
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Old 06-26-2011, 08:30 PM
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Originally Posted by Appalachian American View Post
Could you go with less offset to move the centerline out? Im afraid I dont know enough about tire tech to figure this on out.
Correct.

Some people don't have problems with 31's on stock wheels but it's possible during hard turns or suspension flex for the tire to rub against the frame and/or the corner of the front swaybar. Lower offset and backspacing can prevent the rubbing but it can also cause rubbing along the edge of the fender. Lifting and/or cutting the fender can alleviate those problems.

I wouldn't go any lower than 0 offset. The common sizes people get are 15x7 with 4-4.25" backspacing or 15x8 with 4.5" backspacing. Both of those sizes are 6mm offset (compared to 51-52mm on stock wheels) and shouldn't cause any problems.

I have 31x10.5's on 15x7 with 4" backspacing and even after cranking the tbars a little over 1.5", I still had to trim the back corner of the fenders in order to turn properly.
 
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Old 06-27-2011, 09:49 AM
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The cutomer service people at cragar said I should go with a 15x8 with 4" backspace. Does that sound right? It looks like Im gonna have to modify the fenders any way I go. With the 3" lift I shouldn't have to cut much should I?
 
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Old 06-29-2011, 09:15 AM
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my question is if i go with the 15 x 7 and keep the tire a p235 do i have to modify or will the fit right in....
 
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Old 07-03-2011, 10:53 AM
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I say to both of you: 15x7 with 4.25 BS
A15x8 would not help but in fact cause more problems. My Blazer is 7in rear/6in front higher than a normal Blazer and I think 15x8's could give me problems on hard offroading, so I definitely wouldn't recommend it for you.
 

Last edited by NCSWP; 07-03-2011 at 11:50 AM.
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Old 07-03-2011, 08:03 PM
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Originally Posted by mrkevinmjr View Post
my question is if i go with the 15 x 7 and keep the tire a p235 do i have to modify or will the fit right in....
I just did this on my Blazer 2 months ago..no problems except a tiny bit of rubbing on the inside of the back of the front wheel well if you understand all that lol. but anyways you should be just fine its no big deal to me...
 
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Old 07-04-2011, 02:45 AM
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Originally Posted by 98chevyblazer View Post
I just did this on my Blazer 2 months ago..no problems except a tiny bit of rubbing on the inside of the back of the front wheel well if you understand all that lol. but anyways you should be just fine its no big deal to me...
yeah, but the way I see it there is no reason to run a 15x8, they are more expensive, more likely to rub and you don't need an 8in wheel for a 10.50 and if you were to step up to a 12.50 (nobody really does) then you really should run a 10in. Just my 2 cents.
 
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Old 07-04-2011, 09:10 AM
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I mean that I am currently running 15x7 on my blazer

Sorry bout that
 
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