Rear derailleur pulley sticking when pedaling in reverse

[bake0408]

(10-07-2010, 12:55 PM)DaveM Wrote:  You are right that this shouldn't happen. It could be the pulley, but it could also be something binding up in the freewheel/freehub, the chain binding somewhere on the rear cogs' teeth or in the derailleur, or either of the two pulleys. Any of these would lock the chain and make the bottom of the derailleur cage pull forward. Probably have to start eliminating things.

If you lift the chain off and test the pulleys you should be able to feel if they are binding at all.
If you can make this happen again, hold the position and look at the chain as it passes through the whole rear area. Is binding on anything.
Take your wheel off and try spinning the cogs, is it smooth & quiet?

When you're coasting, does the top section of the chain ever suddenly pull forward and the chain goes slack? If so, your freewheel/freehub is probably binding up inside.

I am not really sure where it is sticking. I just know that at some point it is sticking and causing the chain to lengthen and eventually fall off. Would the first place to start be to lubricate any particular area?? It is a brand new bike, I have only ridden it for maybe 10 hours or less. So I can't imagine it is anything too serious.