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I ride a bike trail that is pea gravel and sand. It makes for a bit of dust. I have learned through thousands of miles to replace my chain every 900 miles. At this mileage it has about 1/16 inch stretch per foot which I have learned is the maximum you want to go to avoid unnecessary wear on the sprockets. I have also learned that for my situation too frequent lubing of the chain is detrimental as well as too infrequent. Once every 200 to 300 miles is best for me.
As for the cassette sprockets, on some types you can take the sprockets off and flip them around if they are excessively worn and they are good as new again. I do this as well as dress the teeth with a chainsaw file to get another go round from them.
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