Quote:
Originally Posted by JTRATX
Mine look the same. I had a stoptech BBK on my M3 that did the same thing, only on the fronts. Have no clue why it does that, but never had any issues.
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Did you race with these rotors?
When you take the wheel off the rotors are marked with minimum thickness and minimum weight. We did not disassemble them so I can't say anything about the weight. However the rotor thickness is slightly higher than minimum except for at the area where these grooves were cut into the rotors by the pads. There it's well below the minimum considering that the grooves are 0.6 to 1.5 mm deep, (each face is different).