Below are the key measurements for determining your Alcon rotor (disc) specs. These are required when ordering custom rotors.
W=Width of rotor (mm)
D1 = Overall diameter of rotor (mm)
D2 = Inner diameter of braking surface
N =Number of rotor/hat mounting holes
PCD = Diameter of center-to-center of rotor-hat mounting holes.
Alcon Brake Kits