15" with 285mm four pot brake upgrade, no spacers.... great for track use. Larger tyre sidewall gives you a bit of a cushion. Same size sidewall with 17" rims is just silly. :roll:
Could you take 2 measurements of your brakes for me please?
From the centre of the hub to the end of the caliper and from the wheel mating surface to the heaight of the caliper (edge closest to the spokes)?