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2. Electronic gear-shifting system - Wikipedia

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

   As of 2009, one system was commercially available from a major parts manufacturer: Shimano's Di2 (Dura-Ace 7970) for road bicycles. While the traditional method of gear shifting uses mechanical control levers that pull and release Bowden cables and spring-loaded derailleurs, Di2 is controlled by electronic switches located either in the ...

3. Derailleur - Wikipedia

   en.wikipedia.org/wiki/Derailleur

   Notice that these family names do not give the exact shift ratios: the 2:1 shift ratio is in fact about 1.7 (Or 1.9 on the Dura Ace series up to 7400) rather than 2, and the native SRAM shift ratio is about 1.1. The family names of these standards are reversed by some in actuation ratio notation as opposed to that of the more common shift ratio.

4. Racing bicycle - Wikipedia

   en.wikipedia.org/wiki/Racing_bicycle

   The system did not catch on due to technological hurdles. 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.

5. Shimano Launches 12-Speed GRX Di2...and its 2x Only

   www.aol.com/lifestyle/shimano-launches-12-speed...

   Deputy Editor Tara Seplavy reviews the latest Shimano GRX Di2 12-speed components—it’s only 2x, which will disappoint many 1x drivetrain-loving gravel riders.

6. Shimano - Wikipedia

   en.wikipedia.org/wiki/Shimano

   Shimano, Inc. (株式会社シマノ, Kabushiki-gaisha Shimano), originally Shimano Iron Works (島野鐵工所) and later Shimano Industries, Inc. (島野工業株式会社), is a Japanese multinational manufacturing company for cycling components, fishing tackle and rowing equipment, which also produced golf supplies until 2005 and snowboarding gear until 2008.

7. Shimano Total Integration - Wikipedia

   en.wikipedia.org/wiki/Shimano_Total_Integration

   Shimano STI Dual Control shifter and brake lever: 1. Main lever 2. Release lever A. Pulling the main lever towards the rider applies the brake B. Pushing the main lever towards the center of the bike downshifts one, two or three gears depending on how far the lever is pushed (right hand shifter) or changes from a small chainring to a larger chainring (left hand shifter)