sunday now dodgy.. esp as rear brake fucked and new rear wheel hub yet to arrive If a miracle occurrs I'll be up for any ride that gets me home at 12:45 ish.... bit like the last few sunday rides..... Big G and dave are out.... Norton and Tlr are in....[+ ? cofe]
reference
The standard way to measure chain wear is with a ruler or steel tape measure. This can be done without removing the chain from the bicycle. The normal technique is to measure a one-foot length, placing an inch mark of the ruler exactly in the middle of one rivet, then looking at the corresponding rivet 12 complete links away. On a new, unworn chain, this rivet will also line up exactly with an inch mark. With a worn chain, the rivet will be past the inch mark.
up to a certain amount of chain stretch you can replace just the chain - over this and you will get recommended to change cassette and chain rings:referenceIf the rivet is less than 1/16" past the mark, all is well.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.
fuck that, use a chain gauge tool.
but seriously, the best way to get chain longevity is to have a series of chains that you swap regularly so that the sprockets and the series of chains all wear at the same slow rate.
I've got orders to go to church due to getting married next week.