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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.
A fat tire is a type of wide oversized bicycle tire, typically 3.8 in (97 mm) or larger and rims 2.6 in (66 mm) or wider, designed for low ground pressure to allow riding on soft unstable terrain, such as snow, sand, bogs, and mud. [70]
The wheel size is sometimes erroneously called "650B" [8] [9] as a "marketing term" by some manufacturers for their 27.5", but the 650B size has traditionally been a designation for a 26 inch diameter (ISO ~ 40-584 demi-ballon tire) using the same ISO 584 mm rim [10] used by French tandems, Porteurs and touring bicycles.
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. [29] 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.
[38] (584 mm rims with large volume ISO 56-584 knobby tires, aka; balloon, are also known as 27.5 inch mountain bike wheels) 650C - ISO 44-571 (26 ⋅ 1 + 3 ⁄ 4 ) - Formerly 47mm wide on Schwinn cruisers and for British trade/delivery bikes.
Tubular tire rolled from rim to show glue between them A tubular tyre , referred to as a tub in Britain, [ 1 ] a sew-up in the US, a single in Australia [ citation needed ] , or just a tubular is a bicycle tyre that is stitched closed around the inner tube to form a torus .