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A twist-style 14-speed indexed shifter made by Rohloff 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.
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)
Shimano Nexus gear shift lever. Shimano Nexus is a brand of bicycle components ... parts lists at Shimano. Range reportedly 0.75 to 1.545 for a total range of 206% ...
Brake lever: a lever for actuating a bicycle brake; 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
In 2001 Shimano introduced a set of trekking components called Di2 (Digital Integrated Intelligence), which included electronic shifting and automatic adaption of front and rear derailleur to riding speed. During the 2000s both Shimano and Campagnolo (2005) [6] experimented with electronic shifting in professional cycle races. [3]
Single-speed mountain bike. 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 ...