Excessive bottom bracket friction
I just had a bike put together for me by a friend of mine who lives a couple hours away. Its a vintage frame that's been converted into a single speeder. I have a brand new Phil Wood bottom bracket in it, and when I ride at low speeds its incredibly smooth, like I'm riding on a cloud. When I start pedalling faster, however, I definately feel some friction coming from the bottom bracket, like its vibrating slightly. It only happens while I'm pedalling. Sometimes I think I can hear it, althougth its mostly a sensation that I feel. Its very slight, but I spent a lot of money on this bike and I feel that it should be perfect. As far as I know, the chainline is perfectly straight. Does anyone know what could possibly be causing the bottom bracket to vibrate, or what could be causing unneccesary friction? Thanks.