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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.
Using the smaller rear wheel allows shorter and quicker handling frames, more options for rear suspension designs and lighter bicycle weight. [23] Another variation is to have a 26″ front wheel with a 29″ rear wheel (commonly called a "69er" though Trek introduced a "69er" in 2007 with a 29″ front wheel and a 26″ rear wheel). [24]
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 ."
The first bicycle "tires" were iron bands on the wooden wheels of velocipedes. [3] These were followed by solid rubber tires on penny-farthings. [4] The first patent for "rubberized wheels" was granted to Clément Ader in 1868. [5] In an attempt to soften the ride, rubber tires with a hollow core were also tried. [6]
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 ...
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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