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Old 09-06-2011, 09:12 PM   #1
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wheel offsets

I have 08 sahara with a leveling kit and wheel spacers now with stock rims and new goodyears. I'm considering new rims and larger tires. What is the size of the offset on the rims to accomodate 35x12.5 or 33x12.5 the best?

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Old 09-06-2011, 09:49 PM   #2
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I don't know the answer but I'll bump it for you.

My recollection is that offset is pretty unimportant in this context--it's backspacing, wheel width and diameter, and bolt pattern you care about.

That said. I'll let those that know better than I comment.

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Old 09-06-2011, 10:05 PM   #3
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I think with 33x12.5R18s you will need less than 4.5" of backspacing. If you go with 33x12.5R15s you will need -19mm of offset and 3.75" of backspacing to clear the calipers. Not sure about 35s.
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Old 09-06-2011, 10:05 PM   #4
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backspacing

Quote:
Originally Posted by MTH View Post
I don't know the answer but I'll bump it for you.

My recollection is that offset is pretty unimportant in this context--it's backspacing, wheel width and diameter, and bolt pattern you care about.

That said. I'll let those that know better than I comment.

I'm thinking offset wasn't the correct term. I think you're correct and backspacing and width is what I'm after. The stock rims are 18"
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Old 09-06-2011, 11:19 PM   #5
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Backspace and offset are the same thing just uses different ways to get there. Offset is in metric and is the offset from the center of the wheel while backspace is in SAE and measures from the back of the wheel at the center hub to the outside of the back of the wheel. So if you have a 8" wheel with a 4" bs then it has a 0mm offset. Same 8" wheel with a 4.75" bs has a 19mm offset.
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Old 09-06-2011, 11:32 PM   #6
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For a 33 on a 8" wheel, you can use a 4.75" bs or 19mm offset. For a 35 you will want to go to a 4.5" bs or 12mm offset. Wouldn't go any lower then a 3.75" bs.

On a 9" wheel you can use a 5" bs with also has a 12mm offset

( example - 12mm is about .5 off center so center of a 8" wheel is 4" which makes a 12mm offset 4.5" bs)
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Old 09-07-2011, 07:31 PM   #7
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That answers my question!

Quote:
Originally Posted by rics1997 View Post
For a 33 on a 8" wheel, you can use a 4.75" bs or 19mm offset. For a 35 you will want to go to a 4.5" bs or 12mm offset. Wouldn't go any lower then a 3.75" bs.

On a 9" wheel you can use a 5" bs with also has a 12mm offset

( example - 12mm is about .5 off center so center of a 8" wheel is 4" which makes a 12mm offset 4.5" bs)

Thank you, that's what I was after!

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