- Not necessarily too many links, could also be so worn that it's too long. If it's not worn you badly need to remove and clean it. Then, whether the same chain or you replace it (and likely freewheel as well) rest of the drive train needs to be cleaned. Check http://sheldonbrown.com/chains.html for info on maintenance, measuring wear and sizing. Just about all you need to know is there.
- Backpedaling is a poor practice - the rear derailleur only has to be a little bit out of line with the cogs to jam, and doing so does not always indicate a problem, especially with friction shifting.
- Finally, though the chain should not rub on the pulley cage in small-small that combo should also not be used.
Last edited by cny-bikeman; 06-16-13 at 11:17 AM.