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2. Electronic gear-shifting system - Wikipedia

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

   The switches send signals through a wiring harness to a battery pack, placed near the bottom bracket. The rechargeable lithium-ion battery pack supplies power to the derailleur motors, which move the derailleurs via worm gears. Shimano estimates that their 7.4-volt battery pack can last up to 1,000 kilometres (620 mi) per charge. [14]

3. Hub dynamo - Wikipedia

   en.wikipedia.org/wiki/Hub_dynamo

   Bicycle dynamos instead use permanent magnets to eliminate the need for a battery to excite the field and initiate electrical generation. Shimano offers a variety of hub dynamos under the "Nexus" brand, such as the DH-3N70/DH-3N71, advertised as having significantly less drag than the Nexus NX-30. SRAM manufactured the i-Light hub dynamo until ...

4. SRAM Corporation - Wikipedia

   en.wikipedia.org/wiki/SRAM_Corporation

   In 2007, SRAM acquired the bicycle component company Zipp. [12] In 2008, SRAM introduced a new road groupset, SRAM RED. SRAM acquired power meter crank manufacturer Quarq in 2011. By 2012, SRAM had incorporated power meters into its high-end RED road group. [13] Also in 2012, SRAM introduced wide range 1x11 mountain bike shifting with its XX1 ...

5. Bicycle drivetrain systems - Wikipedia

   en.wikipedia.org/wiki/Bicycle_drivetrain_systems

   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. Most also include some type of a mechanism to convert speed and torque via gear ratios .

6. List of electric bicycle brands and manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_electric_bicycle...

   This article lists notable electric bicycle brands and manufacturers including electric unicycles. Many bicycle brands do not manufacture their own product, but rather import and re-brand bikes manufactured by others, sometimes designing the bike, specifying the equipment, and providing quality control.

7. 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.

8. Bottle dynamo - Wikipedia

   en.wikipedia.org/wiki/Bottle_dynamo

   Bottle dynamo mounted on a bicycle. Dismantled bottle dynamo. Left: Housing with internal permanent magnet rotating through the friction wheel. Right: Induction coil. A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights.

9. Electric bicycle - Wikipedia

   en.wikipedia.org/wiki/Electric_bicycle

   In the 1890s, electric bicycles were documented within various U.S. patents. For example, on 31 December 1895, Ogden Bolton Jr. was granted a patent for a battery-powered bicycle with "6-pole brush-and-commutator direct current (DC) hub motor mounted in the rear wheel" (U.S. patent 552,271).