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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] The name "29er" comes from a bicycle called the Two Niner, which was offered by the Fisher bike company in 2001, according to 1998 Mountain Bike Hall of Fame inductee Don Cook. [8]
27.5 mountain bikes are mountain bikes which use a large volume tire that is approximately 27.5 inches in diameter, 56 mm wide (ISO 56-584 / 27.5 × 2.25) on an ISO 584 mm rim. [1][2][3][4][5] 27.5 mountain bikes are also called tweeners, [6] since it "fits between" the traditional 26-inch wheels and the newer 29ers ". [7]
a 2006 Tete de Course, designed for road racing, with a head angle that varies from 71.25° to 74°, depending on frame size. Due to front fork suspension, modern mountain bikes—as opposed to road bikes—tend to have slacker head tube angles, generally around 70°, although they can be as low as 62° (depending on frame geometry setting). [3]
Chainstay: a pair of tubes on a bicycle frame that runs from the bottom bracket to the rear fork ends. Chain tensioner: a device to maintain proper chain tension. Chaintug: a device to aid in setting the proper chain tension. Cluster: a bicycle cogset, either a freewheel, or cassette.
The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...
One-piece cranks are easily maintained and reliable, but heavy. They are found on BMX bikes as well as children's bicycles and low-end road and mountain bikes. They fit only frames with American sized (also known as "Pro size") bottom brackets. The bearings are normally open to the elements and easily contaminated, although this rarely causes ...