Hmmm, do you have a PowerLink?? The only time I've had a chain break is because I took it off frequently to wash it. I'm not saying this is what happened in your case, I'm just musing..I have since used PowerLinks and take the chain off rarely, I just use a Park Cyclone to clean up the chain. I'm nervous for severl rides if I've recently taken my chain off and put it back on.