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2. Gear inches - Wikipedia

   en.wikipedia.org/wiki/Gear_inches

   Gear inches is an imperial measure corresponding to the diameter in inches of the drive wheel of a penny-farthing bicycle with equivalent (direct-drive) gearing. A commonly used metric alternative is known as metres of development or rollout distance , which specifies how many metres a bicycle travels per revolution of the crank.

3. 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.

4. Motorcycle transmission - Wikipedia

   en.wikipedia.org/wiki/Motorcycle_transmission

   In earlier times (pre-WWII), hand-operated gear changes were common, with a lever provided to the side of the fuel tank (above the rider's leg). British and many other motorcycles after World War II used a lever on the right (with the brake on the left), but today gear-changing is standardised on a foot-operated lever to the left.

5. 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.

6. Chain drive - Wikipedia

   en.wikipedia.org/wiki/Chain_drive

   If one sprocket rotates at a constant speed, then the chain (and probably all other sprockets that it drives) must accelerate and decelerate constantly. This is usually not an issue with many drive systems; however, most motorcycles are fitted with a rubber bushed rear wheel hub to virtually eliminate this vibration issue.

7. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on the rider and the anticipated ...