MTB Cassettes feature a wide range of sprockets from 11 to 50 teeth. As with chains, MTB cassettes have to cope with a lot of extra demands over their road counterparts. Water, dirt, mud, vegetation and grime all accelerate the wearing process between the chain and cassette. Regular degreasing and lubrication will extend the life of your cassette and chain. Buying a new cassette is a good opportunity to think about gearing, do you need lower or higher gearing for your regular rides? Merlin stock cassettes from Shimano, Sram and Hope.