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2. Sprocket - Wikipedia

   en.wikipedia.org/wiki/Sprocket

   The resulting lower gear ratios make the bike easier to pedal up hills while the higher gear ratios make the bike more powerful to pedal on flats and downhills. In a similar way, manually changing the sprockets on a motorcycle can change the characteristics of acceleration and top speed by modifying the final drive gear ratio.

3. Chain drive - Wikipedia

   en.wikipedia.org/wiki/Chain_drive

   Most often, the power is conveyed by a roller chain, known as the drive chain or transmission chain, [1] passing over a sprocket, with the teeth of the gear meshing with the holes in the links of the chain. The gear is turned, and this pulls the chain putting mechanical force into the system.

4. Roller chain - Wikipedia

   en.wikipedia.org/wiki/Roller_chain

   Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.

5. Motorcycle components - Wikipedia

   en.wikipedia.org/wiki/Motorcycle_components

   A motorcycle fork is the portion of a motorcycle that holds the front wheel and allows one to steer. For handling, the front fork is the most critical part of a motorcycle. The combination of rake and trail determines how stable the motorcycle is. The 'fork' on a motorcycle consists of multiple components.

6. Cush drive - Wikipedia

   en.wikipedia.org/wiki/Cush_drive

   A cush drive is a feature in a motorcycle or scooter drive-train that is designed to reduce stress on drivetrain components during gear or throttle changes. A common design used by almost all street motorcycles has three major pieces: the wheel, the sprocket assembly, and a rubber damper system between the wheel and sprocket.

7. Harley-Davidson Sportster - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Sportster

   1975 Switched to left-side gear change (DOT mandate) 1977 & 1979 Dual exhaust "Siamese" pipes used, introduced on Willie G. Davidson's XLCR café racer in 1977 [6] all models 1979, along with the triangular frame and rear hydraulic disk brake also introduced on the XLCR. In 1977 a limited edition Confederate Edition Sportster was introduced for ...