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A cluster of sprockets, commonly 5 to 12 of them, attached to a freehub on the rear wheel.

4 votes

What is the purpose of the plastic disk between the cassette and the rear wheel?

The other reason for the guard is to help keep chain oil off the brake disc. Once the pads are fouled with oil the brake is useless. Sloppy oiling of the chain can cause a spray of oil droplets to mi …
Brad de Leon's user avatar