I just bought a fixie from a friend and the components are almost new and the chainline is right on. However, when I have the bike on the stand and spin the pedals the chain makes a noise at the rear cog. It is a fast clicking or vibrating sound (don't know how else to describe it). Is this normal????? Any help would be greatly appreciated.
Makino (have the parts; not yet built), EAI Barekuckle, Unknown Japanese fixed conversion, Centurion Dave Scott Ironman road bike (frame), Secret project bike, 2007 Trek Madone 5.2, Cannondale Caad3 mountain bike
Just keepin' this at the top, since I'm wondering the same thing.
mine makes a constant noise that gets a lot worse when the chain is real tight. its not quite a clicking, but its hard to explain otherwise. i've chalked it up to a ****ty hub. im getting new wheels soon, so i'll see if that helps.
Chainrings being not perfectly round causes chain tension to be high (or correct) in most of the revolution and loose in the rest. When the chain tension loosens (at high revolutions) the chain will oscillate, causing some of the noise. Put your bike in the stand and pedal at about 60 rpm and watch to see the chain vibrating. It's like if you stretched out a rubber band and plucked it. If so, get a new chainring (or just deal with it).
This is, of course, after you clean the **** out of your chain and lube it back up.