Which part of the bicycle is the Cassette flywheel located on?

The Cassette flywheel is a part installed in the rear wheel of a bicycle. Specifically, it is a set of chainrings mounted on the hub of the rear wheel. Cassette flywheels usually consist of multiple chainrings, each with a different number of teeth. It is connected to the bicycle's chain and controls the shifting of the chain between different gears through the derailleur, thereby changing the gear ratio and speed of the bicycle.