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2. Shifter (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/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 mechanism.

3. Electronic gear-shifting system - Wikipedia

   en.wikipedia.org/wiki/Electronic_gear-shifting...

   A set of small satellite shifter buttons, called Blips, can be connected to the shift levers or aero shift module (BlipBox) and placed anywhere along the handlebars as part of the system. A maximum of four Blips can be used per bike. The company also took the opportunity to introduce a new shifting convention with this system.

4. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Brake shifter or colloquially, brifter (see also Shimano Total Integration, Campagnolo ErgoPower and SRAM Double Tap): combined shifter and brake lever control Braze-on : a fitting protruding from a frame to provide attachment, typically for cable housings or tire pumps and similar accessories

5. Shimano Total Integration - Wikipedia

   en.wikipedia.org/wiki/Shimano_Total_Integration

   Shimano STI Dual Control shifter and brake lever: 1. Main lever 2. Release lever A. Pulling the main lever towards the rider applies the brake B. Pushing the main lever towards the center of the bike downshifts one, two or three gears depending on how far the lever is pushed (right hand shifter) or changes from a small chainring to a larger chainring (left hand shifter)

6. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   A shifter may be a single lever, or a pair of levers, or a twist grip; some shifters may be incorporated with brake levers into a single unit. When a rider operates the shifter while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets. The rear derailleur also has spring ...

7. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   Before epicyclic gears were used in bicycle hubs, they were used on tricycles. Patents for epicyclic hubs date from the mid-1880s. [5] [6] The first patent for a compact epicyclic hub gear was granted in 1895 to the American machinist Seward Thomas Johnson of Noblesville, Indiana, U.S.A. [7] This was a 2-speed but was not commercially successful.