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ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.
A bicycle tire is a tire that fits on the wheel of a bicycle or similar vehicle. ... A plus-size tire has a width of typically 2.5–3.25 inches (64–83 mm).
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]
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
The first was the chain drive, originally used on tricycles, allowing a gear ratio to be chosen independent of the wheel size. The second was the pneumatic bicycle tire, allowing smaller wheels to provide a smooth ride. An 1880 penny-farthing (left), and the first modern bicycle, J. K. Starley's 1885 Rover safety bicycle (right)
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