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According to a study a human at 70 kg (150 lb) requires about 60 watts to walk at 5 km/h (3.1 mph) on firm and flat ground, [6] while according to a calculator at kreuzotter.de the same person and power output on an ordinary bicycle will travel at 15 km/h (9.3 mph), [7] so in these conditions the energy expenditure of cycling is about one-third ...
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Also of note was the Trek Lime from the 2000s. It used an internal 3-speed hub gear that was electrically shifted based on the rider's speed. Power was provided by a dynamo on the front hub. [3] Current autobike designs of the 2020s build on the principles introduced by the Trek Lime. The front wheel uses a hub dynamo to generate electricity.
Motorized bicycle Bicycle 20 1 bhp (750 W) or 50cc 18 for class III No Oklahoma: Electric-Assisted Bicycle Bicycle 30 1000 W Under 19 16 Unclear. Class A, B, C, or D Oregon: Electric assisted bicycle Bicycle 20 1000 W Under 16 16 No Pennsylvania: Pedalcycle with electric assist Bicycle 20 750 W No 16 No Rhode Island: electric bicycle
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On 1 July 2005, Sudhakar Yadav from India rode a tricycle in Hyderabad with a height of 12.67 metres (41.6 ft), a wheel diameter of 5.18 metres (17.0 ft) and length of 11.37 metres (37.3 ft). This tricycle is exhibited at the Sudha Cars Museum and has been verified as the largest tricycle by the Guinness World Records .
Time trial bikes used by the Astana team in 2015. A time trial bicycle is a racing bicycle designed for use in an individual race against the clock. Compared to a road bike, a time trial bike is more aerodynamic, has a shorter wheelbase, and puts the rider closer to the front of the bicycle. It may have either a solid disc or spoked wheels. [1]
San Francisco Critical Mass, April 29, 2005. Critical Mass is a form of direct action in which people travel as a group on bicycles at a set location and time. The idea is for people to group together to make it safe for each other to ride bicycles through their streets, based on the old adage: there's safety in numbers.