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Old 01-16-2008, 07:45 PM   #1
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Wheel backspacing question?

So I went to a local tire shop today, looking for some used steel wheels, since I pretty much hate my wheels I have now. I found a set of nice black steelies, no curb rash, nothin bad. They are 15x8, and the owner of the place said he would let them go for $150 installed, which I thought was a killer deal. I didn't round up the whole set, but I saw 4, so maybe I'll have to buy another wheel, too. Not too big of a deal. My Jeep came with the wheels and tires it has now, and I am not sure on the backspacing or anything, just know they're 15" wheels. My question is: What would be the optimum backspacing for my Jeep, and how would I measure that so I make sure I am buying wheels that will fit and look right, with no rubbing, or no more than it rubs now. Can anyone help me out? Thanks a lot guys

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Old 01-16-2008, 08:51 PM   #2
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jack up one side and install one ogf the wheels. then you can see how much it sticks out.

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Old 01-17-2008, 12:02 AM   #3
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Or could I just measure my spare, since its the same wheels as what I have, and measure the wheel at the shop? Easier than jacking anything up. I just don't know where to measure for the backspacing. I have an idea but not exactly.
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Old 01-17-2008, 10:55 AM   #4
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lay the wheel face down (street side facing the floor, back side facing up) and measure from the hub mounting pad (the center circle where the 5 lug holes are, where the wheels mount) and measure from there to the lip of the wheel.
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Old 01-17-2008, 03:12 PM   #5
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Oh, okay, simple enough. Thanks
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Old 01-17-2008, 03:14 PM   #6
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lay a board across the wheel to help measure when you do.
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Old 01-17-2008, 10:05 PM   #7
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I was thinking the same thing, but something short that will only sit on the edge of the wheel because the tire sticks out on each side. Thanks for the help guys.
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Old 01-17-2008, 10:29 PM   #8
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I couldnt find mine until I went under the Jeep and looked on the back of my rim
I had 15x7's
to get 32 inch tires or bigger you need at least 15x8's
(I had to buy new rims)
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Old 01-18-2008, 01:47 AM   #9
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my wheels are 15x7 and i have 32''.. 33 would not fith though
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Old 01-18-2008, 07:35 AM   #10
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Factory rims are generally 5.5" of BS. Rubicon Moabs are 5" IIRC.

A lower BS number, such as 4" or 3.5" will move the tires/wheels further out.

I have 4.25" of BS and my 33x12.5's do NOT rub when flexing, but DO rub a bit at full lock, but not too bad (unless I'm offroad and have it cranked all the way over and nail the gas in 4lo - then I snap a brake line - SERIOUSLY). I have the factory wheels (Canyons) and use the Spidertrax spacers.

If I could find some black wheels for a decent price and in good shape, I wouldn't mind going that route and getting to about 4 or 3.75" BS for better results.

So for 33x12.5, 3.75-4" is probably where you want it to be. If it is any higher than that, bigger/wider tires may have issues when turning and flexing offroad.

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