by Fred » Sun May 11, 2014 1:15 am
According to the internet centre bore:
FC = 59.6
FD = 67.1
R32 = 66.1
This concurs with my findings today (guess, then measure as best I could). It also means I'll have to machine the GTR rims to use them on stock Mazda hubs, or machine the hubs to fit the GTR rims.
Rear brake rotors are 285x18 or a little more width. This is bigger than the stock fronts, which seems appropriate once I fit decent fronts to it. Even if I ditch the calipers and put different/better ones on, I can keep the drum hand brake, which is superior to disk handbrakes in every way.