BB7 troubles, help!
Hello all, I'm having troubles installing a rear 8 inch avid BB7 on my .243 racing frame. It should be a quick bolt onto the rear IS frame mount, but I'm having clearance issues. Basically, when I slide the caliper over the rotor, the bracket (the bit which is bolted into the caliper body, and which in turn bolts onto the bike's disc tabs) touches both the disc on one side and the frame's mounting tabs on the other.
The frame is designed to accomodate an 8 inch rotor, and the bracket is definitely the rear bracket. Additionally, the frame is not bent (the droupouts are about 1/4" steel, so it's not exactly fragile). I contacted the frame manufacturer, and they said they hadn't heard of such clearance issues before with these particular brakes. The caliper can only be oriented one way as far as I can tell, so that isn't the problem. Is it possible that the bracket is just a bit too fat, and I'll have to grind its profile down a couple millimeters?
Has anyone else had this problem and solved it? Am I missing something totally obvious? Thanks in advance for any help!