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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. [3] [8] [11]
The front wheel from a racing bicycle. Bicycle wheel with wooden rim Nipples Spokes Cross-section of a rim A Shimano Dura-Ace freehub-style hub. A bicycle wheel is a wheel, most commonly a wire wheel, designed for a bicycle. A pair is often called a wheelset, especially in the context of ready built "off the shelf" performance-oriented wheels.
Larger wheels roll over obstacles more easily. The ability of a wheel to roll over obstacles is proportional to its size. A 29″ wheel, which is about 10% larger than a 26″ wheel, can roll over 10% larger obstacles. [citation needed] The larger diameter wheels have more angular momentum so they lose less speed to obstacles and rough sections.