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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 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."
Conventional metallic bicycle wheels have 24, 28, 32 or 36 spokes. Wheels on tandems and BMX often have 40 or 48 spokes to support additional stresses and weight. Lowrider bicycles may have as many as 144 spokes per wheel. [20] [21] [22] Wheels with fewer spokes have an aerodynamic advantage, as the drag is reduced. The reduced number of spokes ...
However the bicycle marketed as the Aventura by Apps' own company, Cleland Cycles Ltd, between 1982 and 1984 used the more readily available Nokian Hakkapeliitta 26 × 2 (ISO 54-584). 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]
Gravel tires come in a variety of sizes and widths. The most common are 650b (27.5 inches) and 700c (29 inches). Tire width can vary from 30 to 50 millimeters (mm). The lower end of that range is closer to road bike tires, making them better suited for light off-road situations.
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