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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]
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
M730 1987 6-speed; M732 1989 7-speed; M735 1992 7-speed; M737 1993 8-speed; M739 1995 8-speed; M750 1999 9-speed (first groupsets sold already in 1998, these sets are code-stamped WK onwards) M760 2003 9-speed; M770 2008 9/10-speed Rear derailleur: introduction of Shadow low-profile design, which reduced the risk of damage from side hazards.
The 14-speed Rohloff Speedhub hub gear, introduced in 1998, has a range exceeding 5 to 1, and is thus comparable in range to 24, 27 and 30-speed derailleur systems (with 3×8, 3×9 and 3×10 cogs front and rear), since the latter have three overlapping ranges often with only about 14 distinct gears. As there is no overlap with the Speedhub, the ...
The Lamborghini Aventador uses a single-clutch lightweight 7-speed automated manual gearbox built by Graziano. [ 7 ] [ 8 ] Despite being single-clutch, gear-shifts are accomplished in 50ms. The Gallardo and the first-generation Audi R8 used a mid-engine Graziano gearbox ( manual or automated manual versions).
The rechargeable lithium-ion battery pack supplies power to the derailleur motors, which move the derailleurs via worm gears. Shimano estimates that their 7.4-volt battery pack can last up to 1,000 kilometres (620 mi) per charge. [14] The system also has an LED light to warn when it needs a charge. [15]
In 2008, Campagnolo introduced 11-speed drivetrains with Super Record, Record, and Chorus groupsets. Campagnolo has released an electronic version of its drivetrain. [7] In April 2018 Campagnolo launched 12-speed Record and Super Record groupsets, [8] and in 2020, the company launched Campagnolo Ekar, a 13-speed groupset aimed at gravel riders. [9]
In 1966 Sturmey-Archer launched a new two-speed hub with a backpedal shifting action similar to the Fichtel and Sachs 'Torpedo Zwei Gang Duomatic'. The S2 – Sturmey-Archer's first 2-speed hub since the demise of the T series in 1941 and the last two speed they would make in the UK – featured a direct drive and a 28.6% gear reduction.
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