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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.
The inner width of the rim on which the tire is mounted should be about 65% of the tire's nominal section width for tires smaller than 30 mm and 55% for those larger. The section height of a tire is usually identical to its section width (for tires less than 28 mm, 2.5 mm have to be added to the width to get the height).
These rims are the same bead seat diameter as 700C wheels and are generally compatible with bicycle frames and tires designed for the 700C standard, however, rims designated as 29 inch are designed for wider tires than rims designated 700C, so frame clearance may be an issue. The formerly popular 27 inch (630 mm) wheel size is now rare.
His approach was to use a balloon-width tire of about 57 mm (2.25″) on a 500 mm (20″) rim, giving a wheel of approximately 600 mm (24″) in diameter. [2] 1965 Series 2 Moulton Deluxe. The man credited with being the father of modern small-wheel bicycles is Alex Moulton who pioneered the field with his F-framed Moulton Bicycle in 1962. His ...
The 26-inch wheel size initially used in mountain biking has all but died off at the top level of cross-country racing, with 29″ wheels becoming the norm and 650b wheels being used occasionally. 650b wheels are 584 mm diameter wheels, and approximately 27.5″ with a mounted tire, hence their more common name, "27.5 inch wheels."
Road racing bicycle forks have an offset of 40–50 mm (1.6–2.0 in). [7] ... the fork offset, or the wheel size (diameter) on the trail.