But do you also check the chains tension on a regular basis, or was it just flapping around and that was the reason it came off? You got off lightly with just the chainguard damage the chain could have caused far more, including locking the rear wheel and you ending up in hospital because of it. The chain could also have snapped and ripped into your leg, not nice! Nope i didn't, think i checked it once or twice there wasn't any obvious hanging so i thought it would be okay, it did lock up my rear wheel, jumped off the sprocket and goy stuck between the bolts and the swing arm and was more like an emergency stop wasn't too bad didn't lose balace just looked at the back like" why me" You were lucky this time, next time?????