the numbers quoted on this thread are for fair weather flat-land commuters who live in dry areas. on average i wear out 1.5 chains, 0.5 cassettes, 1 set of tires, and three disc pads each year. the three disc pads are from exclusively using the front disc brake (using your back brake is pointless). i stopped using rim brakes because i got tired of paying $400 for new wheels every 3 years. riding in heavy rain with tons of grit and sand on the road will eat through a drive train and wheel rims like butter (no matter how anal you are).

once high end alfine components lose more weight i will kiss my externally geared drive train good bye. and good f***ing riddance.