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Cassette: What is the Cassette on my Bicycle?



The cassette is the stack of sprockets in the center of this photo. The largest gears are to the left (inside) and are the easiest to pedal. The smaller gears to the outside allow the rider to go fastest.

(c) David Fiedler

Ever hear someone talk about the cassette on their bike? Or have someone suggest your cassette might need replacing? It's not a tape for playing music, nor related to a videocassette, like most people know the word. The cassette is part of your drivetrain, which is your pedals, crankarms, chain and sprockets. It is the stack of gears on the rear wheel of a bike that a person can shift to make the riding easier on hills or to go faster. The chain moves from one gear to another on your cassette by use of the rear derailleur.

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