Quote:
Originally Posted by Z K
10mm is fine if you are using the OEM M3 wheels. They have a tapered lip that makes it seat flush with the spacer. The only time you have to worry with 10mm spacers is with aftermarket wheels - you'll have to see if they have enough taper at the hub to sit flat.
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I don't think the interface between the wheel and the spacer is the issue. It's the interface between the spacer, hub and hub centric lip. If the lip is thicker than the spacer then the spacer will be suspended away from the hub face - won't sit flat.