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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. Single-speed bicycle - Wikipedia

   en.wikipedia.org/wiki/Single-speed_bicycle

   Racing bicycle, once equipped with multiple gears and derailleurs, converted to single speed. Note the semi-horizontal drop-outs, and redundant second chainring. While track bicycles are always single speed, mountain bicycles, road bicycles, cyclo-cross bicycles, and hybrid bicycles can be made as or changed into a single speed. Mountain bike ...

4. Motorized bicycle - Wikipedia

   en.wikipedia.org/wiki/Motorized_bicycle

   As to technical level, it was analogous to pre-WW2 German models, with minimal changes made to later 80s. The only clip-on kit engine was "D" series ("Д-4" ... "Д-8Э", designed by Soviet engineer Filip Priboloi), a single-speed chain-driven 45cc 2-stroke motor with manual clutch and a rotary slide valve in a crankshaft.

5. Fixed-gear bicycle - Wikipedia

   en.wikipedia.org/wiki/Fixed-gear_bicycle

   As a general rule, fixed-gear bicycles are single-speed. A derailleur for gear selection would introduce chain slack, which would interfere with braking. Gear selection can, however, be accomplished with the use of an internally geared hub. For example, a Sturmey-Archer fixed-gear three-speed hub is a fixed-gear multi-speed arrangement. Most ...

6. Manual transmission - Wikipedia

   en.wikipedia.org/wiki/Manual_transmission

   Six-speed manual transmissions started to emerge in high-performance vehicles in the early 1990s, such as the 1990 BMW 850i and the 1992 Ferrari 456. The first 6-speed manual transmission was introduced in the 1967 Alfa Romeo 33 Stradale. The first 7-speed manual transmission was introduced in the 2012 Porsche 911 (991). [9]

7. Electric vehicle conversion - Wikipedia

   en.wikipedia.org/wiki/Electric_vehicle_conversion

   The electric vehicle conversion industry has grown to include conversion car garages, [25] aftermarket kits [26] and vehicle components. [ 27 ] [ 28 ] Some companies focus specifically on certain classic cars (i.e. VW Beetle , Rolls-Royce, Jaguar, Citroën H Van , etc.) [ 29 ] [ 30 ]