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12 speed – 5.3 mm (13 ⁄ ... 5.3 mm (13 ⁄ 64 in) (SRAM) 13 speed – 4.9 mm wide ... long enough so that it can be shifted onto the largest front chain ring and ...
The new RED groupset features a 12-speed cassette with wider gear range and smaller steps between gears in addition to many other innovations such as chainrings with power meter integration, a fluid damper for the rear derailleur pulley cage, and both 2x and 1x chainring drivetrain variants.
In 2015 SRAM announced its wireless electronic groupset called, SRAM RED eTap. The group was released in Spring of 2016 and is available on complete bikes and through aftermarket SRAM component dealers. [10] [11] A wireless system that can be retrofitted onto any bicycle was announced in 2016. [12]
Many modern, high-end mountain bikes have begun using entirely one chain ring drivetrains, with the industry constantly pushing the number of rear cogs up and up, as shown by SRAM's Eagle groupsets (1 by 12) and Rotor's recent 1 by 13 drive-train. [12] Most road bicycles have two chainrings, and touring bicycles commonly have three.
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
For a time 10 mm pitch chains, sprockets, and chainrings were used for motor-paced racing, to reduce the size and weight of the transmission system. "Shimano Nexus" Shimano's family of internally geared hubs. Available in 3-, 7- and 8-speed with or without a coaster brake. The Nexus hubs are comparable in range to a full 16–20-speed system.