Anyone know if the JCW calipers and rotors from an R56 will fit on a countryman??

 

At first blush I would have said yes given same front drivetrain generally, but then I realize it's a "no" regardless--all other modern mini's are 4 x100 bolt pattern (as in 4 bolts on a 100mm pattern), countryman is a 5 x 120 pattern. Pretty standard pattern for BMW's apparently, but not for other MINI's to date. Thus if nothing else, the rotor lug bolt holes just plain won't work even if everything else were in order.

 

I wonder if the BMW 135i calipers and rotors would fit then??

 

you would have to look at the rotor offsets and the caliper bolt up pins or brackets. Might look at X3 donor possibility too since built in same factory.

...Of course so was the prior Chrysler minivan AWD drivetrain. MINI and BMW don't seem to mention that for some reason...