I have pm four piston brake calipers on it but the rotors have gotten really loose where the floater rings are. the original rotors are 10 1/2 inch and will not work with the pm calipers. i thought about an adapter plate for the calipers to work with the original rotors but it looks like the brake line will not be long enough to reach if they even make an adapter plate. it bits that these very expensive rotors are now junck.