Quote:
Originally Posted by Mirko
I know for stock z4m wheels you need at least a 12mm spacer for the front. If you know the offset of the stock wheels and the CSL wheels you could technically figure it out or be close.
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It's actually quite hard to infer wheel clearance this way. When I had installed the RacingBrake front fixed caliper on my MZ4 Coupe, the front MZ4 style 224 wheels took a 5mm spacer to clear (really only needed 3mm), while a set of OEM E46 M3 wheels I was using as my track rims needed a 12mm spacer due to the curvature and shape of the spokes.
I like inTgr8r's idea of using some 1mm washers to determine the minimum size spacer you'll need. Works better if you have studs rather than bolts though.