Originally Posted by
rooftest
Huh? If you broke a chain, wouldn't the rear derailler move the opposite direction? (towards the smallest cogs)
What happened to me (on a new bike with less than 500mi) is one side of the chain broke causing a single link to make a V shape which the caught/jam in the derailler and pulled it toward the wheel.
That's what I meant by 'partly break' a chain. A full brake would cause no harm.
Al