Confused about backspacing and overall wheel size (What backspacing for a TJ?) - JeepForum.com

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post #1 of 22 Old 03-23-2009, 08:00 PM Thread Starter
uknowwho
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Confused about backspacing and overall wheel size (What backspacing for a TJ?)

I tried to do a search, but I think I'm just confusing myself more. What would fit better on a stock 1997 Wrangler Sport? I am looking at these...

CRAGAR Wheels Black Rock Series 952 Street Lock Steel Wheel in Matte Black... and will probably get a set of BFG Mud Terrain tires.

I don't understand all of this backspacing stuff. The sizes I am looking at are...
15x8 with 3.75 backspacing
15x8 with 4.75 backspacing
15x10 with 3.75 backspacing

Is anyone running these wheels on a TJ? If so, pics would be appreciated.

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post #2 of 22 Old 03-23-2009, 08:13 PM
diy4x4
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Check out this link from 4x4xplor. It might help http://www.4x4xplor.com/rockcrawlers.html
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post #3 of 22 Old 03-23-2009, 08:16 PM
Divinitous
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The shallower the backspace, the farther out the rims are.

What size tires are you going with? If you're looking at something around 12" then you will want a shallow backspace. It'll keep the tires from rubbing on turns and it'll make you more stable. But, remember that PA requires the flares to cover the full tread of the tire. So factor either the price of wider flares or consider narrower tires and keep the stock 4.75 backspacing.

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post #4 of 22 Old 03-23-2009, 08:17 PM
otisdog
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15 x 8 with 3.75 is the best choice. The backspacing determines how much clearance there is between the tire and Jeep components - in other words how far the tire is moved out. This is quite important with bigger wider tires to deal with rubbing issues. Stock backspacing is 5-5.5" which has the tire in much closer to the spring perchs etc.
8" wide wheels will hold the bead better than 10" when you air down on trails.
Jim

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post #5 of 22 Old 03-23-2009, 08:19 PM
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Quote:
Originally Posted by otisdog View Post
15 x 8 with 3.75 is the best choice. The backspacing determines how much clearance there is between the tire and Jeep components - in other words how far the tire is moved out. This is quite important with bigger wider tires to deal with rubbing issues. Stock backspacing is 5-5.5" which has the tire in much closer to the spring perchs etc.
8" wide wheels will hold the bead better than 10" when you air down on trails.
Jim
x2.............
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post #6 of 22 Old 03-23-2009, 08:30 PM
Parish
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Are cragar soft 8's available with a 3.75 backspacing?

Last edited by Parish; 03-23-2009 at 08:31 PM. Reason: i suck at spelling
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post #7 of 22 Old 03-23-2009, 09:24 PM
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Quote:
Originally Posted by Parish View Post
Are cragar soft 8's available with a 3.75 backspacing?
i couldnt find any so i went with "4
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post #8 of 22 Old 03-23-2009, 10:38 PM Thread Starter
uknowwho
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Thanks for the replies... now I understand. Basically backspacing gives you more turning clearance for wider tires.
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post #9 of 22 Old 03-24-2009, 07:15 AM
2005X
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Quote:
Originally Posted by uknowwho View Post
Thanks for the replies... now I understand. Basically backspacing gives you more turning clearance for wider tires.
right, so you wouldnt want a 12.5 wide tire with "5BS cause you rub like crazy.
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post #10 of 22 Old 03-30-2009, 08:35 PM
scott33
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33x10.5

So if I were running 33x10.5 the 8" rims with 3.75 backspacing would be sufficient?
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post #11 of 22 Old 03-30-2009, 08:53 PM
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So if I were running 33x10.5 the 8" rims with 3.75 backspacing would be sufficient?
yup............
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post #12 of 22 Old 07-29-2009, 05:53 PM
emayer32
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i know im kind of bringing this back from the dead but why is 5" back spacing less then 3.75". less is more?
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post #13 of 22 Old 07-29-2009, 05:57 PM
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Quote:
Originally Posted by emayer32 View Post
i know im kind of bringing this back from the dead but why is 5" back spacing less then 3.75". less is more?
It pretty much equates to a negative value, so yes less is more.

Less backspacing means more sticking out.
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post #14 of 22 Old 07-29-2009, 05:59 PM
Rubi Unlimited
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Quote:
Originally Posted by emayer32 View Post
i know im kind of bringing this back from the dead but why is 5" back spacing less then 3.75". less is more?
The spacing is on the back of the wheel. Less spacing means the rest of the wheel sits more outboard. More backspacing means the wheel will sit more inboard. As I understand it.

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post #15 of 22 Old 07-29-2009, 06:14 PM
emayer32
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duh. i get it now you measure from the hud to the inside of the jeep the backspacing is that number so of course you put spacers on the number becomes smaller see not as dumb as i look.
edit: Thank you for your help
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