Cassettes

Replace your chain every time you replace your cassette. Worn cassettes allow the chain to slip over the sprocket teeth, rather than to mesh securely into the valleys.

The standard fitting for attaching sprockets to the back wheel is the cassette. The cassette fits over the ratcheting mechanism, the freehub. This is bolted onto the hub, with the bearing at the outboard end. The freehub allows the wheel to go round on its own without pushing the pedals, that is to freewheel. The freehub makes a clicking noise when you freewheel. Cassettes and freehubs are made by different manufacturers, but all adhere to the standard Shimano-fitting pattern. The outer shell of the freehub is splined, a fancy way of saying it has grooves in it. The cassette has a matching set of grooves to slide over the freehub. Everything is kept in place with a lockring, that screws into the outer end of the freehub. The first common…

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