@mstone 35615 wrote:
You shouldn’t have to change the cassette at the same time as the chain unless you wait too long to replace the chain.
What Sheldon Brown says about changing the chain.
If the rivet is 1/16″ past the mark, you should replace the chain, but the sprockets are probably undamaged.
If the rivet is 1/8″ past the mark, you have left it too long, and the sprockets (at least the favorite ones) will be too badly worn. If you replace a chain at the 1/8″ point, without replacing the sprockets, it may run OK and not skip, but the worn sprockets will cause the new chain to wear much faster than it should, until it catches up with the wear state of the sprockets.
If the rivet is past the 1/8″ mark, a new chain will almost certainly skip on the worn sprockets, especially the smaller ones.
