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I measured it to find the offset and backspacing.

I'm assuming 1" = 25.4 mm

If the backspacing is from the mounting surface to the very back of the rim it is: 4.25"

The offset is the mounting surface to the centerline. The wheel is actually 9" wide including the outer lips. 8" inside the outer lips.

9/2 = 4.5 - 4.25 = .25 = 6.35 mm negative offset

8/2 = 4 - 3.75(.5" less from excluding lip) = .25 = 6.35 mm negative offset

I have never found any information on this anywhere in the entire world. I hope my calculations are right.

Now, I have ASA JS5's from tirerack.com. They came with .75" spacers and in a BMW bolt pattern (5 x 120) They fit fine and have had no problems for 2 years. So the spacers come out to be: 19.05 mm

So to place the rims the same as factory it would mean the offset of the rims is:

19.05 - 6.35 = 12.7 mm positive offset

So hypothetically I could use any rim with the same bolt pattern and same spacer if it had a 10 - 15 mm positive offset. Maybe even 20mm.

I hope this all makes sense. Let me know if anything is obviously wrong.
 
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