Ministry of Transportation / Ministère des Transports
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What to do if a chain breaks

Chain failure usually is caused by a worn or stretched chain, which does not fit the sprockets properly, or by worn sprockets. You will notice if the chain breaks because you will instantly lose power to the rear wheels, and the engine will speed up. If the chain locks the rear wheel, you will not be able to disengage it, and it will cause your motorcycle to skid. Try to maintain control and find a safe place to pull off the road as soon as possible.