I recently built my first fixie and have some problems with noise coming from the drivetrain. The bike has a Dura-Ace 1/8" cog, Wipperman 1/8" chain and a Campagnolo 3/32" chainring without shifting ramps. Chainline is about 1mm off (can't get it any better with my set-up) and my chain is'n too tight. The sound is a contiuous metal-on-metal clicking. All parts are brand new. Perhaps I just need to let the drivetrain "break-in"?