Quote Originally Posted by sarahspins View Post
If it's wedged in there really good between the cassette and the chainstays (frame) you'll need to loosen the wheel like you were going to take it off to get the chain free... and then pull it back over one of the smaller sprockets. Make sure your derailleur is lined up with the sprocket you put the chain back on before you try to ride again (just eyeball it from above - if you're off by a gear either way nothing catastrophic should happen).
Thanks for the tip should this happen again. I am pretty sure that it was due to my shifting - the left shifter requires more force to shift it than I expect it to, and I suspect it was operator error in this case. They just adjusted my shifter cables the other day (brand-new bike) as they were rather loose.

I have a one-on-one maintenance class at my LBS on Jan. 16th, and it couldn't come sooner This was actually one of the questions I was going to ask - what to do when the chain comes off...