At first thought it sounds like a loose high-limit screw on the front derailleur. Put the bike in the highest gear (largest front chainring and smallest rear cog). Tighten H screw while pedaling (backwards OK) until it begins to rub, then back it off till rubbing stops.
But why is the chain not seated on the chainring teeth in the picture?
Last edited by JiveTurkey; 07-23-08 at 10:14 PM.
Originally Posted by slopvehicle
Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.
Looks like the "old" chain is stretched out (worn) and is too long to fit the cogs in the sprockets. You probably need a new chain. And that probably means you need new rear sprockets, either a new cassette or freewheel, depending how old.
Thanks guys, I thought maybe the chain was stretched out too much. I attached the photo because it looks like the inability to catch the chain is what's causing the chain to fall off. It doesn't rub against the derailleur once it hits that cog.
Yeah, it should, your high limit screw is too far out, like post #2, pedal, turn the high limit in until it rubs, and then back off just a little, in your large (front) / small (rear) combination there should be less than 2mm gap between the outside of the derailleur and the chain.