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Drivetrain
From WikiPedalia
The parts of a bicycle which have to do with generating forward motion. These include the pedals, cranks, chainwheels, bottom bracket, chain, derailers, rear sprocket(s) and rear hub.
The drivetrain area of a frame consists of those parts of the frame that are directly stressed by the drive train parts, specifically the chainstays, down tube, and seat tube.
