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  2. Shimano - Wikipedia

    en.wikipedia.org/wiki/Shimano

    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 ...

  3. Electronic gear-shifting system - Wikipedia

    en.wikipedia.org/wiki/Electronic_gear-shifting...

    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.

  4. Freehub - Wikipedia

    en.wikipedia.org/wiki/Freehub

    A Shimano Dura-Ace freehub. ... especially single speed, and cheaper models of derailleur bicycles. ... Fits 11-speed and 12-speed SRAM mountain bike ...

  5. Groupset - Wikipedia

    en.wikipedia.org/wiki/Groupset

    2 derailleurs, front and rear; 1 bottom bracket; 1 crankset; 1 chain; 1 cogset, freewheel or cassette; With the following forming part of some groupsets: 1 headset (more commonly included with vintage groupsets) 1 seatpost; 2 hubs, front and rear (although, most manufacturers now offer groupset-branded pre-built wheels) Pair of pedals

  6. Derailleur - Wikipedia

    en.wikipedia.org/wiki/Derailleur

    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]

  7. Bicycle chain - Wikipedia

    en.wikipedia.org/wiki/Bicycle_chain

    1976: Shimano briefly made their own 10 pitch Dura-Ace track-specific system with 10 mm (3 ⁄ 8 in) (approximately) pitch from about 1976 [13] to 1980 [14] —called Shimano Dura-Ace 10 pitch. The Shimano 10 pitch system is incompatible with ANSI standard #40 (1/2″) e.g. chains, sprockets and so on, [ 15 ] [ 16 ] and was outlawed by the ...

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