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2. 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.

3. Bicycle lighting - Wikipedia

   en.wikipedia.org/wiki/Bicycle_lighting

   Red light on the back of a bicycle Early bicycle lighting: candle lamps, oil lamps and carbide lamps Early bicycle lamps and two early bottle dynamos (1935). Bicycle lighting is illumination attached to bicycles whose purpose above all is, along with reflectors, to improve the visibility of the bicycle and its rider to other road users under circumstances of poor ambient illumination.

4. Beryl (company) - Wikipedia

   en.wikipedia.org/wiki/Beryl_(company)

   Its founder Brooke developed the "Laserlight" bike lights which are now used as part of Santander Cycles, London's public bike hire scheme.This light projects an image of a bicycle, in green, onto the road about 6 metres (20 ft) ahead of the bike, visible round corners and in blind spots.

5. Electric bicycle - Wikipedia

   en.wikipedia.org/wiki/Electric_bicycle

   Electric bicycle usage can have several health benefits and rider safety can be improved through the use of a helmet. E-bike use was shown to increase the amount of physical activity. E-bike users in seven European cities had 10% higher weekly energy expenditure than other cyclists because they cycled longer trips. [53]