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2. Shifter (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Shifter_(bicycle_part)

   Road bike shifter - integrated with brake levers, sometimes known as a "brifter". [ 2 ] In 1990, Shimano introduced their Shimano Total Integration , STI, shifting levers for road bicycles, this was an indexed shifting system and the first to integrate shifting with the brake levers.

3. 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)

4. Electronic gear-shifting system - Wikipedia

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

   The first commercially successful electronic gear shift system for road bicycles was introduced by Shimano in 2009, the Di2. [3] Three professional teams used the Di2 in the 2009 Tour of California: Columbia High Road, Garmin Slipstream, and Rabobank; [3] and several teams and riders, including George Hincapie, used it during the 2009 Tour de ...

5. SRAM Double Tap - Wikipedia

   en.wikipedia.org/wiki/SRAM_Double_Tap

   SRAM Double Tap shifter and brake lever. SRAM Double Tap is an integrated gearshift and brake lever system designed by SRAM Corporation for racing bicycles. [1] It allows shifting gears without having to remove a hand from the bars, unlike previous down tube shifting systems.

6. Shimano Nexus - Wikipedia

   en.wikipedia.org/wiki/Shimano_Nexus

   Inter 8 - The Inter 8 has interval percentages between the gears of 22, 16, 14, 18, 22, 16, 14, and a total range of 307%, comparable to a road bike derailleur gear systems, but as the other Nexus products, it is designed and intended for urban commuter use. The hub comes in a variety of versions, weighing between 1550 and 2040 grams stripped.

7. SRAM Corporation - Wikipedia

   en.wikipedia.org/wiki/SRAM_Corporation

   Although SRAM began as a manufacturer of road bike shifters, the company had largely left the road market in 1993 in favor of the rapidly growing mountain bike market. However in 2004, SRAM began developing two new road groupsets: Force and Rival, which it brought to market in 2006.