Bicycle Roller Chain And Gears. Running Chainring Over The Rear Sprockets (Also Known As A Cassette). With A Chain Drive Transmission, A Chainring Attached To A Crank Drives The Chain, Which In Turn Rotates The Rear Wheel Via The Rear Sprocket(S) (Cassette Or Freewheel). There Are Four Gearing Options: Two-Speed Hub Gear Integrated With Chain Ring, Up To 3 Chain Rings, Up To 11 Sprockets, Hub Gear Built Into Rear Wheel (3-Speed To 14-Speed). The Most Common Options Are Either A Rear Hub Or Multiple Chain Rings Combined With Multiple Sprockets (Other Combinations Of Options Are Possible But Less Common).

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