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Old 08-09-2016, 08:05 AM
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Proper Back Spacing ?

When I bought my 93 YJ, it came with a set of Jeep alloy rims of which the former owner had no information of their origin. I have recently discovered that they were originally Jeep Cherokee rims thus the reason I had to install 1.5" spacers (temp fix).

My question is this: What is the correct back spacing for a 93 YJ with 15x8 rims? I'm currently running 31x10.50 BFG All Terrain TA's on those Cherokee rims and want to get shed of them.

Also, if I was wanting to go bigger, let's say 33x12.50x15, what would be the needed back spacing for 15x10 rims to keep them from rubbing?

Thanks for any advice- Mark

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Old 08-09-2016, 08:52 AM   #2
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You don't really have much of a choice out there. Stock wheels usually have nearly 5" backspace, while most all aftermarket have 3.75" or so. In your case, removing the spacers and getting 3.75'ish wheels will be a wash. Stick with x8" if you plan x12.5" tires. Do NOT go to x10" wheels, way to wide for a YJ.

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Old 08-09-2016, 10:52 PM
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JeeperDon, thanks for the advice. I think I've made up my mind to stick with the 8" rim and the 31x10.50 tires.
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Old 01-24-2017, 01:07 AM   #4
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Could you tell me does more back spacing equal more of the tire outside of the fender well?
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Old 01-24-2017, 11:15 PM   #5
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Less backspacing means more tire outside of the fender. So a rim with 2.5" of backspacing will sit 3" further out than 5.5" of backspacing, if they are the same rim width.

Backspacing is measured from the wheel mounting surface to the back edge of the rim.
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Old 01-25-2017, 12:35 AM   #6
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Less backspacing means more tire outside of the fender. So a rim with 2.5" of backspacing will sit 3" further out than 5.5" of backspacing, if they are the same rim width.

Backspacing is measured from the wheel mounting surface to the back edge of the rim.
Thank you! I just bought some steel wheels and was concerned they were incorrect. The new rims are 25x8 with 4" backspace. I'm running 31x10.5 with a 3" body lift. Hopefully, these wheels I bought are a good choice....
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Old 01-26-2017, 12:07 AM   #7
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Those rims will work great for 31s. Stepping up to 33s might cause rubbing, and 35s will definitely rub on the springs with them though. Just mentioning it, because I know you'll be wanting them sooner rather than later
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Old 01-31-2017, 06:55 PM
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Those rims will work great for 31s. Stepping up to 33s might cause rubbing, and 35s will definitely rub on the springs with them though. Just mentioning it, because I know you'll be wanting them sooner rather than later
Who knows...

I went and traded for an old set of MT Classics 15x10's. I haven't measured the back spacing yet, but they are plenty deep enough to keep my 31's from rubbing which also means I got shed of the spacers. Downside...I'm having a hell of a time finding 1 more (or something remotely close) so I can have a proper spare.
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Old 02-01-2017, 10:12 PM   #9
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Be careful with those 10" wide rims and 10.5" wide tires. With the rims being as wide as the tires, there's not a lot of pressure on the bead. I've seen that combo work fine on the streets, but you can't air down as far when going off road without blowing the bead.

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