Disc caliper housing rubs on rotor
I'm building up a Specialized AWOL frame with a Rohloff Speedhub. The frame has post mounts for disc brakes, and I ended up buying a set of Avid BB7's. They are the brakes the complete bike ships with from Specialized, so I didn't plan on any compatibility issues.
Front caliper and rotor mounts up fine. Rear caliper housing rubs on the rotor. My first thought was to shim the rotor outward from the hub, but there isn't room there for shims, and it would raise the rotor above the inner guide circle on the hub. There is some play built into the mounting brackets for the calipers, but it doesn't allow enough room to move the caliper out of the way of the rotor.
One suggestion was to use a file to remove some material from the caliper housing to allow for more movement, but there isn't much material there to remove. That seems to be about the only option I can think of however. Either the spacing of the rotor on the Rohloff hub is atypical, or there is an issue with the frame.
Just wondering if anyone has run into this issue before, and what your solution was.