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Old 04-28-2013, 02:12 PM   #1
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Need Wheel Offset and Tire Size Opinions

I'm a Jeep Newbie. Bought a 98 Sport and have 30X9.5's on it, want to run 31's or 33's. Will primarily be used on the street and like the BF TA's. I'd like them to fit under the jeep without sticking way out like some urban douchemobile. I understand 33's will extend out a ways, not a problem with that, but don't want them to rub. Asked a couple of local jeep owners and they had no idea what their offset was. The local tire shops had various opinions. 2 also said it had stock lift, 2 said it had a 2" lift!
Any help/suggestions from real jeep owners would be greatly appreciated.

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Old 04-28-2013, 06:45 PM   #2
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You can run 31x10.5s with no lift and stock rims.. And they will not stick out.. You can run 33x10.5 with a 1.75" or 2" budget boost and a 1" body lift.. Any wider than 10.5 and they will stick out .. I like keeping everything under the fenders, and am running 255/85/16s with OME 2.5" and 1" body lift .. Hope this helps..

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Old 04-28-2013, 06:48 PM   #3
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A 33x12.50 needs about 3.5" lift and a wheel with 4.25"-3.75" bs.
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Old 04-28-2013, 06:54 PM   #4
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yeah well they pretty much covered it.......only caution/ issue is SL because you want your Jeep to "work" on and off road, or only care about looks won't wheel so cheapest way to fit whatever wheel tire combo you choose.....why buy parts you don't want or need?
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Old 04-28-2013, 08:12 PM   #5
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Forget you ever heard the term 'offset' which is more useful for car wheels. With Jeeps, the dimension you need to be concerned with is backspacing. Offset and backspace are two different measurements, the terms are not interchangeable. Offset measures the distance from the wheel's mounting flange to the center of where the tire is seated.

Backspacing is the distance between the rear edge of the wheel & its mounting flange as is being measured by the yellow tape measure below. It basically sets how far inward the tire's inside sidewall will be positioned. The more backspacing, the more inward the tire & wheel will be positioned.

The amount of backspacing needed depends on the tires width. A 10.5" wide tire like a 31x10.50 can get away with factory wheels which have anywhere from 5.25" to 5.5" of backspacing. A 12.5" wide tire lke a 33x12.50 needs to be moved outward at least an inch since its sidewall will be an inch closer to the suspension than a 31x10.50 is. Typical BS dimensions for a 12.5" wide tire is usually 3.75" to 4.25", though 4.5" of BS can work if you also add a couple washers to each of the two steering bolts stops.
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Old 06-04-2013, 08:54 PM   #6
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Im going to be replacing my bent steel wheels (another story for another day!).My tires inside edge hits the control arm on tight turns.What backspacing should I use to maybe help eliminate this? I have added washers to the stops already. My backspacing choices are 3.65,3.75 or 4.00.
Im thinking 4.0,correct since that will get the inside edge of the tire farther away from the lower arm??
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Old 06-04-2013, 08:59 PM   #7
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Quote:
Originally Posted by 1jeeplvr View Post
Im going to be replacing my bent steel wheels (another story for another day!).My tires inside edge hits the control arm on tight turns.What backspacing should I use to maybe help eliminate this? I have added washers to the stops already. My backspacing choices are 3.65,3.75 or 4.00.
Im thinking 4.0,correct since that will get the inside edge of the tire farther away from the lower arm??
Look at Jerry's post above and you'll see, the larger the backspacing number, the closer "inboard" the tire will be. With that said, 4" is still plenty of room for most widths and applications.

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