Just to add...
Quote:
Originally Posted by rictus01
given the size difference the front will wear 4 x as quickly under normal use, and the fact you've had an old chain on it would have increased the wear rate somewhat,
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... and a worn sprocket is much harder on the chain. In some respects, chain life can be limited to that of the CS sprocket.
A tip that I was put onto many years ago was to buy three (or more) counter shaft sprockets with each chain/sprocket set and even out the wear by rotating those CS sprockets in order at each service regardless of wear. Each CS sprocket gets used three or more times depending on intervals and what is done, or not done, to destroy the chain by the time the chain is spent.
Combined with regular cleaning and an oiler it is possible to get exceptional or at least well above average mileage from a chain.
Cheers