Quote:
Originally Posted by XB101
Alright so I can buy BMW OEM wheels that is designated for the F25. I can also get after market items that will work (Tirerack and local shops). I saw a set of BBS 18" and the offsets are 40 rear and 35 front. Spec say 45mm offset for the F25. Would putting in spacers make the set up work geometrically?
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35 mm offset (for the fronts) is not good for the F25 chassis. A 10mm or 12.5 mm spacer is probably needed. The spacer should have a centering ring, but most do not.
What is the width of the rears? If they are significantly wider than 8 inches, you will have better geometry with a 40 mm offset than 45 mm. If they are narrower than 7.5 inches, a 5 or 7 mm spacer would restore near perfect geometry. However a spacer that thin may be hard to find. Commonly, they come in 12.5 mm and 19mm.
On the other hand the spec is 45 +/- 2mm so 40mm with 8" wheels is very close (3 mm error), and shouldn't create any real problems.