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Deore XT is a mountain and touring bike groupset first introduced by Shimano in 1983. [1] It was Shimano's first mountain bike groupset, based on their existing Deore touring groupset, and it consisted of a triple-, double- or single chainring crankset, front and rear derailleurs, handlebar-mounted "finger" shifters, cantilever brakes, and large-flange hubs. [1]
They can be used individually, as an external derailleur or an internal hub gear, or in combinations such as the SRAM Dual Drive, which uses a standard 8 or 9-speed cassette mounted on a three-speed internally geared hub, offering a similar gear range as a bicycle with a cassette and triple chainrings. Derailleur gears. Cogset; Crankset; Hub gear
Innovations include index shifting (known as SIS, Shimano Index System introduced in 1984), [9] freehubs, dual-pivot brakes, 8-9-10-speed drivetrains, and the integration of shifters and brake levers. Also, these components could only work properly when used with other Shimano components; for example, its rear derailleurs have to be used with ...
One example is the Protean two-speed derailleur available on the Whippet safety bicycle. [4] The French bicycle tourist, writer and cycling promoter Paul de Vivie (1853–1930), who wrote under the name Vélocio, invented a two speed rear derailleur in 1905 which he used on forays into the Alps. [5]
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 ...
Hyperglide is the name given by cycling component manufacturer Shimano to a sprocket design in their bicycle derailleur tooth cassette systems. [1] It varies gear tooth profiles, and/or pins along the faces of freewheel or cassette sprockets, or between the chainrings in a crankset , to ease shifting between them.
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. Down tube: tube on the bicycle frame that runs from the head tube to the bottom bracket
Shimano XT rear derailleur on a mountain bike. The majority of bicycles transmit power from the crankset to the drive wheel with a bicycle chain. Derailleur gears, featured on most racing and touring bicycles, offering from 5 to 30 speeds