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A handful of bicycle frames are made from magnesium, which has around 64% the density of aluminum. In the 1980s, an engineer, Frank Kirk, devised a novel form of frame that was die cast in one piece and composed of I beams rather than tubes. A company, Kirk Precision Ltd, was established in Britain to manufacture both road bike and mountain ...
a 2006 Tete de Course, designed for road racing, with a head angle that varies from 71.25° to 74°, depending on frame size. Due to front fork suspension, modern mountain bikes —as opposed to road bikes —tend to have slacker head tube angles, generally around 70°, although they can be as low as 62° (depending on frame geometry setting).
An aluminium bicycle has a frame made of aluminium alloys. A plastic bicycle was an attempt in the early 1980s to introduce a bicycle made entirely out of plastic materials instead of metal. A wooden bicycle has a frame made out of wood. One example is the Chukudu used in the east of the Democratic Republic of Congo. A carbon bicycle is made of ...
The result is the equivalent diameter of a penny-farthing wheel. A 60-inch gear, the largest practicable size for a high-wheeler, is nowadays a middle gear of a utility bicycle, while top gears on many exceed 100 inches. There was at least one 64-inch (1.6 m) Columbia made in the mid-1880s, [48] but 60 was the largest in regular production.
Portage strap: a strap (usually made of leather) attached to the inside of the bike frame, designed to make carrying the bike over one's shoulder easier; Pulley wheel: see Jockey wheel; Power meter: a device on a bicycle that measures the power output of the rider; Quick release: a skewer with a lever on one end that loosens when the lever is ...
The 650B size, also known as 27.5″, reappeared in 2007 [6] as a compromise between the 26 inch and 29 inch sizes. The 650B size is called 27.5″. [7] The name "29er" comes from a bicycle called the Two Niner, which was offered by the Fisher bike company in 2001, according to 1998 Mountain Bike Hall of Fame inductee Don Cook. [8]
A mountain bike with 29″ wheels is often referred to as a 29er, and a bike with 27.5-inch wheels is called a 27.5 Mountain bike or as a marketing term ″650B bike". [ 27 ] Wheels come in a variety of widths, ranging from standard rims suitable for use with tires in the 1.90 to 2.10 in (48 to 53 mm ) size, to 2.35 and 3.00 in (60 and 76 mm ...
Too much trail makes a bicycle feel difficult to turn. Road racing bicycle forks have an offset of 40–55 mm. [2] For touring bicycles and other designs, the frame's head angle and wheel size must be taken into account when determining offset, and there is a narrow range of acceptable offsets to give good handling characteristics. The general ...