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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 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.
It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes. For example, at least 6 different "26 inch" sizes exist (just by American notation), and "27 inch" wheels have a larger diameter than American "28 inch" (French "700C") wheels.
It was initially rated (SAE gross) at 250 hp (186 kW) with a two-barrel carburetor (referred to as "2V" in engine designations) or 290 hp (216 kW) with a four-barrel (designated "4V"). Emissions compliance led to a compression drop in 1971, and when Ford switched to net power ratings in 1972 power ratings had fallen to 153 to 161 hp (114 to 120 ...
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