The bikes came up for their periodic maintenance check last week, and I seem to have amazingly managed to wear out 3 chains simultaneously :(
Park Tool recommend chain replacement at 1% wear (and to watch from 0.75%).
Interestingly, Sheldon Brown recommends replacement at 1/16" stretch over 12 links (a link being exactly 1 inch in length - a pitch of half an inch).
If I have got my math. right, that's 0.52% wear. (He goes on to say that if you leave it until 1.04% wear, it's game over for avoiding wear to your chainset and cassette's popular rings/sprockets).
So, 0.52%,0.75% or 1% - Discuss!
(I'm going with 0.75% as I have noticed it getting less rideable).
