[BritishGreen68]

I measured it.. the rotor being 13" exactly, the caliper adds about 1/2" of diameter, or distance from the opposite edge of the rotor 13.5".. The face of the caliper (part you see with the wheel on) is about 1/4" in (towards center of car) from the wheel mounting surface of the rotor. What wheels are you using? I would say this brake setup provides alot of room, with the caliper being "inward" from the wheel mount surface of the rotor it leaves room for wheels that are flat on the back.. these might fit behind a 16" wheel, and 17's should be easy..