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Yet another Wheel backspacing question

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Old 03-26-2008, 05:10 AM
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i am running 35 x 12.50 on a 15 x 10 rim (- 45mm offset) no rubbing lock to lock. rubs the flenders a little at full flex.
Old 03-26-2008, 11:54 AM
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Originally Posted by wayoflife
Factory JK Wheels have 6.25" of Back Spacing. I have physically measured them myself to verify this.
The 7.5x17" wheels (with 255/75 tires) on my german sahara have + 44.45 mm offset (1.75 "), marked in the wheels. Isnīt that 5.5" of backspacing ? Are there different wheels for export ?
Old 03-26-2008, 01:27 PM
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8.5" wheel with +12mm offset should be 4.75 BS
Old 03-26-2008, 02:03 PM
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I bought a set of Pro Comp wheels with 5in BS and they rubbed at full lock. They had 13.5 wide tires. I put a set of Pro Comp 4.5 BS on another Jeep same size tire and they don't rub at all.
Old 03-27-2008, 08:52 AM
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Originally Posted by Andy25
Are we talking 4.5 " backspacing on a 8 inch rim with a 12.5inch tyre or a 9 inch rim on a 12.5 inch tyre ???? there is a difference
Actually, there's not. 4.5" of backspacing is 4.5" of backspacing. Offset changes with the wheel's width even when backspacing remains the same. Check out this chart.




You learn a lot in a year. I guess old threads never die.

Last edited by BLKRUBI; 03-27-2008 at 08:55 AM.
Old 03-27-2008, 08:57 AM
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Originally Posted by Phishjeep
8.5" wheel with +12mm offset should be 4.75 BS
Nope! 8.5" with a +12 is 5.25" of Backspacing. My Ultra Thunders had these specs.
Old 03-28-2008, 12:45 PM
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Originally Posted by BLKRUBI
Actually, there's not. 4.5" of backspacing is 4.5" of backspacing. Offset changes with the wheel's width even when backspacing remains the same. Check out this chart.




You learn a lot in a year. I guess old threads never die.
Thank you that helps ...

But, e.g: o mm offset is 0 mm offset. Backspacing changes with the wheel's width even when offset remains the same.

In Germany, we just have "offset", no one knows "backspacing" ...
Old 03-28-2008, 01:17 PM
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Originally Posted by wayoflife
Factory JK Wheels have 6.25" of Back Spacing. I have physically measured them myself to verify this.
Are all the wheels the same? How much spacing on the Rubi wheels?



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