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I recently replaced a Miche 20t sprocket (Miche 19t sprockets and above are alloy) because of wear after two years of use. At the same time I replaced the 48t chainring, which was about three years old. They were on a bike I ride between about 1500 and 2000km per year (including in winter and off-road).
hullian
Is anyone actually doing serious miles on a aluminium sprocket?