Rebuilt my front brake caliper on 76ss which was not on the bike when I bought it. I'm using a 750k caliper. When you rotate the front wheel it binds in one spot. Is my rotor warped? It did not bind before with worn pads. In looking on ebay for a used rotor I've found them for 76ss with six lug like mine but the diameter is 11 and 5/8 mine is 10 and15/16 also I've found them with my diameter but with only five mounting holes. My brake is on Invader wheels. What do I have on my chopper? Help please. Update I believe it may be a 500 or 550 they have the same part number and are smaller in diameter but I need to be sure. If anyone can help I'd appreciate it. Andrew