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The front derailleur, however, switches gears almost 30% faster than Dura-Ace’s mechanical counterpart. [1] On traditional bikes, the front derailleur is problematic because the chain can be under tension and has to make a large vertical jump between chainrings. The electronic system's controlled motion overcomes these problems.
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]
In 2009, Shimano commercially released the Dura-Ace Di2 electronic shifter, and Campagnolo and SRAM followed suit in the early 2010s. As of 2022, the vast majority of top-level professional teams use electronic shifting, as do many amateur riders. Mechanical derailleurs remain popular with amateur racers and recreational riders for cost reasons.
The Ineos Grenadiers team-bikes were equipped with Shimanos newest 9150 Dura-Ace Di2 groupset, whilst Pinarello claimed the F10 was 6.3% lighter and 7% stiffer than its predecessor (still composed of Torayca T1100 1K carbon), whilst a 53 cm unpainted frame has a claimed weight of only 820g. The F10 also has a 12.6% claimed aerodynamic advantage ...
One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...
Shimano 105 1055SC 7-speed rear derailleur: ... 11-speed 9070 : 11-speed Di2 ... (Shimano 5000 : 7-speed) Positioned between Dura Ace and Ultegra 600. Characterized ...
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