Well, it happened. Twice, in fact. Commuting to work today for only the second time. Cold, windy, heavy back pack and POW! Suddenly the crank arms won't move. The first time I was able to get the chain unstuck from between the smallest chainring and the bottom bracket, but the second time it was stuck for good and I didn't have the right tools (or knowledge for that matter) to get it unstuck. I bailed and used the trusty cell phone to call in a ride.

How can I make sure this doesn't happen again? I'd really rather not go through these ribbings here at work because I had a bike problem.

If it helps any, 2002 Trek 1000 with Shimano Sora components.

PH