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2. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed, but most modern bicycles have multiple gears and thus multiple gear ratios.

3. 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.

4. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   A hub gear, [ 1] internal-gear hub, [ 2] internally geared hub[ 3] or just gear hub[ 4] is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed ...

5. Bicycle drivetrain systems - Wikipedia

   en.wikipedia.org/wiki/Bicycle_drivetrain_systems

   A chain drive and rear derailleur gear change, the most popular system in use today. A shaft-drive with crankset and rear gear hub. Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism ...

6. Derailleur - Wikipedia

   en.wikipedia.org/wiki/Derailleur

   Derailleur. Shimano 600 front derailleur (1980) A derailleur ( French pronunciation: [deʁajœʁ]) is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another. [ 1]

7. Single-speed bicycle - Wikipedia

   en.wikipedia.org/wiki/Single-speed_bicycle

   A single-speed bicycle is a type of bicycle with a single gear ratio. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. There are many types of modern single speed bicycles; BMX bicycles, most bicycles designed for children, cruiser type bicycles, classic commuter bicycles ...

8. Bicycle performance - Wikipedia

   en.wikipedia.org/wiki/Bicycle_performance

   The fitness and cadence of the rider, bicycle tire pressure and sizes, gear ratios, slope of the terrain affect the overall speed of the rider. Bicycles designed for flat urban environments may have singlespeed gearing or three speeds and bicycles designed for hilly terrain, hauling weight, or traveling faster have more gears.

9. Shifter (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Shifter_(bicycle_part)

   Shifter (bicycle part) A bicycle shifter or gear control or gear levers is a component used to control the gearing mechanisms and select the desired gear ratio. Typically, they operate either a derailleur mechanism or an internal hub gear mechanism. In either case, the control is operated by moving a cable that connects the shifter to the gear ...