Re: first breakdown
Actually only two things will cause a roller chain to derail. Sprocket alignment and/or tension.
A foreign object getting between the chain and sprocket would be the exception.
Many things might cause one or both to be off; engine or rear wheel moving, sprocket wobble, tensioner not set right or has moved. Etc and etc.
You'll need to do everything you can to assure that the sprockets are aligned and that the chain tension stays between 1/2" to 3/4" of slack. Proper lubrication also plays into this.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"
Last edited by 2door; 05-21-2014 at 02:59 PM.