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  2. Electronic gear-shifting system - Wikipedia

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

    Finally, the entire 7970 groupset weighs approximately 113 grams (4.0 oz) less than the 7800 it replaces but 68 grams (2.4 oz) more than the new 7900. [17] In 2011 Shimano introduced the Ultegra Di2 [18] electronic gear change set, a cheaper version of the electronic Dura-Ace system. This set seemed to provide an electronic option within reach ...

  3. List of bicycle brands and manufacturing companies - Wikipedia

    en.wikipedia.org/wiki/List_of_bicycle_brands_and...

    This page lists notable bicycle brands and manufacturing companies past and present. For bicycle parts, see List of bicycle part manufacturing companies.. Many bicycle brands do not manufacture their own product, but rather import and re-brand bikes manufactured by others (e.g., Nishiki), sometimes designing the bike, specifying the equipment, and providing quality control.

  4. Comparison of hub gears - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_hub_gears

    Shimano Alfine SG-500 2006 2016 (?) [15] 8 307% 1600 g City Shimano Nexus Inter-8: 8 307% 5th gear 1550-2040 g City Shimano Nexus Inter-7: 1995 7 244% 1465-1860 g City Shimano Nexus Inter-5E 2019 5 263% 60 Nm 1st gear 1650 g e-bike Shimano Nexus 4 Speed 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM Spectro E12 (Elan)

  5. Bicycle drivetrain systems - Wikipedia

    en.wikipedia.org/wiki/Bicycle_drivetrain_systems

    A chain drive and rear derailleur gear change, the most popular system in use today A shaft-drive with crankset and rear gear hub. Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels.

  6. Comparison shopping website - Wikipedia

    en.wikipedia.org/wiki/Comparison_shopping_website

    The general nature of shopping focused price comparison websites is that, since their content is provided by retail stores, content on price comparison websites is unlikely to be absolutely unique. The table style layout of a comparison website could be considered by Google as "Autogenerated Content and Roundup/Comparison Type of Pages". [ 17 ]

  7. Bicycle gearing - Wikipedia

    en.wikipedia.org/wiki/Bicycle_gearing

    A Rohloff Speedhub hub gear A Shimano XT rear derailleur on a mountain bike A bicycle gearbox with chain tensioner. Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns.