three-wheeled roller

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• Roller skating — is the traveling on smooth terrain with roller skates. It is a form of recreation as well as a sport, and can also be a form of transportation. Skates generally come in two basic varieties: roller skates and inline skates or blades, though some… …   Wikipedia

• Roller mower — Roller mower, or rollermower, is a term generally applied to tractor powered multi spindled rotary mowers that have full width rollers front and rear. Most rollermowers attach to a four wheeled tractor via the three point linkage and are powered… …   Wikipedia

• Roller derby — For the skate brand of the same name, see Roller Derby (brand). Roller derby Charm City Roller Girls (Baltimore, Maryland). Characteristics Contact Collision C …   Wikipedia

• roller coaster — 1. a small gravity railroad, esp. in an amusement park, having a train with open cars that moves along a high, sharply winding trestle built with steep inclines that produce sudden, speedy plunges for thrill seeking passengers. 2. a car or train… …   Universalium

• Roller coaster — For other uses, see Roller coaster (disambiguation). The Scenic Railway at Luna Park, Melbourne, is the world s oldest continually operating rollercoaster, built in 1912 …   Wikipedia

• Roller ship — The roller ship, or roller steamer, was an unconventional ndash; and unsuccessful ndash; ship design of the late nineteenth century, which attempted to propel itself by means of large wheels. Only one such vessel was constructed ndash; the Ernest …   Wikipedia

• History of the roller coaster — The history of the roller coaster stretches back to ice slides constructed in 17th century Russia and spans all the way to the many and varied modern coasters of today. In between, numerous technological innovations have been introduced to make… …   Wikipedia

• Shuttle roller coaster — A shuttle roller coaster is any roller coaster that ultimately does not make a complete circuit, but rather reverses at some point throughout its course and traverses the same track backwards. These are sometimes referred to as boomerang roller… …   Wikipedia

• Motorized bicycle — A VéloSoleX motorized bicycle A motorized bicycle, motorbike, cyclemotor, or vélomoteur is a bicycle with an attached motor and transmission used either to power the vehicle unassisted, or to assist with pedaling. Since it always retains both… …   Wikipedia

• Tricycle — For other uses, see Tricycle (disambiguation). A tricycle (often abbreviated to trike) is a three wheeled vehicle. While tricycles are often associated with the small three wheeled vehicles used by pre school age children, they are also used by… …   Wikipedia

• Draisine — Drais Laufmaschine 1817 Two person rail cycle draisine with four wheels …   Wikipedia