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2. Derailleur - Wikipedia

   en.wikipedia.org/wiki/Derailleur

   A derailleur (French pronunciation:) 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.

3. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Derailleur: an assembly of levers, usually cable-actuated, that moves the chain between sprockets on a cassette or chainring assembly; Derailleur cage: the part of the Rear derailleur that holds the Pulley wheels; Quick release dropout: a piece on the rear dropout that the derailleur attaches to.

4. Bicycle chain - Wikipedia

   en.wikipedia.org/wiki/Bicycle_chain

   Depending on use and cleaning, a chain can last only 1,000 kilometres (600 miles) (e.g. in cross-country use, or all-weather use), 3,000 to 5,000 km (2,000 to 3,000 mi) for well-maintained derailleur chains, or more than 6,000 kilometres (4,000 mi) for perfectly groomed high-quality chains, single-gear, or hub-gear chains with a full cover ...

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.

6. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   A Rohloff Speedhub hub gear A Shimano XT rear derailleur on a mountain bike A bicycle gearbox with chain tensioner. 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.

7. Rohloff - Wikipedia

   en.wikipedia.org/wiki/Rohloff

   The Rohloff Speedhub 500/14 is the only bicycle hub with 14 gears, which can replace a regular chain derailleur system regarding level of friction and range of transmission. Rohloff AG also used to make an automatic chain lubrication system called Lubmatic, and cycle tools such as a chain riveting tool and a chain measurement tool.