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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 .
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.
The Ruud Manufacturing Company was acquired by Rheem Manufacturing in 1960. [30] Then the company purchased the St. Paul, Minnesota-based National Heater Company in 1969. [31] In 1985, Rheem purchased Raypak. [32] Southcorp Holdings was purchased in January 2002, [33] and in 2005, the company purchased Solahart. [34]
A gearbox bicycle is a bicycle that uses a gearbox [1] [2] to convert torque and rotational speed from the power source, usually the rider's legs, to what is desired at the drive wheel. The gearbox is usually incorporated into the frame near the crank , and it may be used in addition to or instead of derailleur gears or a hub gear . [ 3 ]
The front derailleur, however, switches gears almost 30% faster than Dura-Ace’s mechanical counterpart. [1] On traditional bikes, the front derailleur is problematic because the chain can be under tension and has to make a large vertical jump between chainrings. The electronic system's controlled motion overcomes these problems.
The bicycle's short gearing assisted when cycling uphill, but the CVT was noted to significantly increase the weight of the bicycle. [52] The rise of the electric bicycle has brought a reappraisal of the CVT as a better solution for an optimal drive train set up in comparison to gearing systems historically applied on human powered bicycles.
One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...
An electric wheel hub motor car was raced by Ferdinand Porsche in 1897 in Vienna, Austria. He developed his first cars as electric cars with electric wheel hub motors that ran on batteries. [15] A racecar by Lohner–Porsche fitted with four wheel-hub motors debuted at the World Exhibition in Paris in 1900. Alongside it a commercial model was ...