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Discussion Starter · #1 ·
I am going to be getting some new 35" swampers and rims in the near future. I currently don't know the backspacing on my rims that I have. I would like to go with a bigger back spacing cause my tires hit my shocks when compressed. What would be the most that I should go? Thanks.

1997 TJ w/ 33's & 1984 CJ7 w/35's
http://members.aol.com/a4x4jeeper/
 
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Discussion Starter · #2 ·
Open-ended question. What lift do you have? Which Jeep will the 35s go on?

The 35" measurement is at maximum sidewall width. So, if you Jeep will cleanly handle 30" tires without rubbing and you want to go to 35s, increase the width by half the difference of the tire width: 35-30=5, 5/2=2.5" posative offset.

If you are going to add them to the TJ, you will ned at least a 3" (4"recommended) lift with 1'to-2" body lift to make the grade. A TJ with 33s will work with a 3"-4" suspension lift. You may want to add a washer under the steering stop nuts located at the steering knuckle to prevent rubbing in tight turns.

As far as back spacing, Chrysler recommends a >maximum< of 1" (~24mm) back spacing to avoid unsafe steering geometry. The actual measurement depends on your rim width. For instance, an 8" rim will measure 4-1/2" at centerline (8"wheels actually measure 9" rim-to-rim). This equals zero offset in metric terms. A posative 1" offset from centerline on an 8" wheel will measure 5-1/2" from the >inside< rim, and 24.5mm out from centerline. Standard inch measurement is figured from the inside rim, and metric is measured from the true centerline. Get the idea?

Hewgag

Right Wrongs Nobody
 
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Discussion Starter · #3 ·
For what it's worth, I was asking the same questions about my 33/12.50's not too long ago. I asked a friend, and he told me this. Any rim and tire dealer that knows about 4x4's should know the answer to your question if you tell him (or her) what setup your running. What size lift, what axles (Ford 8.8's will take more stress than D35's) and what size tire and rim.
Hope that helps a little.

~James
There's only one.
(Jeep, not James)
 
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Discussion Starter · #4 ·
the new 35" tires are going on the CJ. It has 7" lift. I want to know what the MOST backspacing that is suggested cause I get rubbing on my shocks and inside fenders now. I currently don't know my backspacing.

How much is too much?

1997 TJ w/ 33's & 1984 CJ7 w/35's
http://members.aol.com/a4x4jeeper/
 
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