Thank you.
It looks like the x3M uses a 2 piece riveted rotor just like the M3, but with a different offset. Ive ordered an M550i rotor, an M performace rotor, and an X3M rotor. I WILL figure this out 🤣
Im not sure what site you guys are using to check these measurements, but can you check the x3m rear rotors? Im starting to think those are what I need.
Shit like this is never simple, and if youre the first person to do it, its even worse!
Good news is fronts fit great. We will see how the new rear rotors fit when they arrive and if I can get the adapters so I can use the full M rotors laters.
Edit - Since the 26.7mm difference is 1.05", I...
I spent a bunch of time trying to figure out what happened yesterday. It appears that the M rotors have a much lower "offset" and are much flatter, so the calipers sit closer to the wheel face. Non-M rotors sit back much further.
For now Ive ordered some cheap 370x24 rotors for a G30 to test...
Well, apparently I screwed up. Picked up a used brake kit from a G80, got the adapters for the front.
The rear calipers do not fit. Do I need a different caliper mount? Different rotors?