Missed this.
Quote:
Originally Posted by WDE82
I got the rear 128i piston diameter. It is 42 mm.
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No, it's 40mm. The performance caliper for the 128i are 42mm and the same as found on some 328i.
Quote:
Originally Posted by WDE82
I The rear E90 328i caliper piston is 44 mm diameter with the same rotor and mounting bracket.
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328i is all over the place, but most I see are 300x20 with 42mm calipers.
Do the rear narrow hub conversion and you can throw on anything that fits on a 335i, which starts at 336x22 with a 44mm piston caliper.