All it says is -27 mm offset. Whats the backspacing? - Jeep Wrangler Forum
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Old 01-15-2012, 11:55 AM
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All it says is -27 mm offset. Whats the backspacing?

Does anybody know what the backspacing would be on a wheel with -27mm offset?

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Old 01-15-2012, 12:12 PM   #2
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Offset to Backspace conversion:

Take offset, divide by 25.4, then add the overall rim width (rim width +1) divided by 2

so: 16x8 with -27 mm offset
-27mm / 25.4 = -1.06" + (((8"+1")/2)= 4.5") = 3.43" BS

Make sense?
With that BS, your wheels are gonna stick out pretty far from your Jeep. IF that's the rim width you're looking at. If not, recalculate.

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Old 01-15-2012, 08:36 PM
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Where dies the height of the rim factor in? Would a 15x8 rim be the same then?
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Old 01-15-2012, 11:08 PM   #4
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Quote:
Originally Posted by Cole 33
Where dies the height of the rim factor in? Would a 15x8 rim be the same then?
Diameter of the rim has nothing to do with backspace or offset.
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Old 01-16-2012, 12:43 AM   #5
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Quote:
Originally Posted by Cole 33 View Post
Where dies the height of the rim factor in? Would a 15x8 rim be the same then?
He just used it as an example. Only the width matters. Yes a 15x8 with -27mm offset would be about 3 1/2" of back spacing.
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