Every full rotation I feel a small clunk. Only in harder gears, if I'm pedaling easy I don't feel anything. Freshly greased b/b bearings, spin nice and smooth. I think the problem might be the chain. I used an old chain, the links all swivel but not smoothly. I do have a new chain ordered. So what do you guys think, the chain? I really don't want to remove the b/b plus I really don't think that's the problem.