Rotor Face Types
In doing so the friction characteristics are modified, different groove and & drilling patterns affect the friction characteristics in different ways, some affect overall friction and others the bite or release characteristics and therefore the best solution is not necessarily the same for each application.
AP Racing is constantly developing and refining Rotor face patterns. The most popular face types are shown below:-
CG4, 8, 12 & 24 =
Digit specifies number of grooves per face.
New standard pattern.
D = Cross drilled
drilled holes chamfered).
Still preferred with some pad materials but can compromise disc life
GA = J hook
Latest design gives improved bite and debris clearance and reduces distortion / vibration, outer grooves do not run out to outside diameter.
N.B. Not all face types are available for every disc.