Quote:
Originally Posted by WDE82
Yes, I would assume it's new parameters for ABS and stability control programs.
I'm not sure what you mean with your comparison of rotor sizes. If you're using E90 335i front calipers, then you use 335i front rotors. The 135i stock rotors are paired with 135i specific 6 piston calipers and pads that fit those rotors.
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The measurements I have for the 335i and Z4 35is rotors is 348mm. You had indicated that the 135i rotors were 338mm. I don't know that to be true, but was noting that the radius of the 335i rotors was 5mm larger than that.