[a427sc]

Dave,

The rotor can be moved slightly toward the spindle (maybe 1/8-3/16" with the spacer/hub machining. This allows the caliper to move away from the wheel spokes. There is also a small amount of movement available to locate the caliper "in" or closer to the spindle. You can even machine the rotor to a smaller diameter to allow the caliper to mount further in for clearance on the D's. This doesn't get a lot of room, but could be the difference between fitting and not. Also check dimentions on the different brand calipers available, and models within the same brand, such as cast vs billet, 4 or 6 piston. It all depends on where you need the extra space. I use a steel lightweight wheel from oval track cars that have the correct back spacing I need and the same 4 3/4 bolt dia mount. Several of the specialty companies will make wheels to your dimentions.

As to the rears. ERA has a big rotor kit for inboards. I used a 10.5 kit from Concours West (before ERA offered their version). With good pads and fluid, and some funky air venting, they were sufficient. I would also recommend in-cockpit adjustable brake bias. This will allow a finer tuning for track conditions and different pad configurations.

Good luck

McFEZ