Take a 12" ruler and place it against the chain, measuring the centre of a rivet to the centre of a rivet. With a new chain, this will be exactly 12". Acceptable wear on this length of chain is 1/16th"; the chain should be replaced if the wear is 1/8th" or more. This works with 9, 10 and 11 speed chains. It's quite easy to see, and no special tools are needed.
If a new chain is needed, pop on a new cassette at the same time and your world will be a better place.
Mark
1 comment:
With my eyesight I'd struggle to spot 1/16inch!
I've used a Park Tool for years - measuring % wear. This enables chains to swapped, and circulated, before excessive wear - saving cassette replacement. However endless threads on the CTC blog indicates no one method fits.
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