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A Suntour Sprint rear derailleur A front derailleur manufactured by Suntour a pair of Suntour road brakes. In 1964, Suntour invented the slant-parallelogram rear derailleur. The parallelogram rear derailleur had gained prominence after Campagnolo's introduction of the "Gran Sport" in 1949, [7] [8] and the slant-parallelogram was an improvement of it that allowed the derailleur to maintain a ...
Down tube: tube on the bicycle frame that runs from the head tube to the bottom bracket Dropout : a bicycle rear fork end that allows the rear wheel to be removed without first derailing the chain. The term dropout is often incorrectly used to refer to any fork end , but not all fork ends are dropouts
The Suntour Swing Shock fork is based on a coil cantilevered swing set-up, and suspension is given by a coil spring which is located within the steerer tube and can be accessed from the top, [9] technology which was originally used for suspension on early motorcycles.
The offset may be implemented by curving the forks, adding a perpendicular tab at their lower ends, offsetting the fork blade sockets of the fork crown ahead of the steerer, or by mounting the forks into the crown at an angle to the steer tube. The development of forks with curves is attributed to George Singer. [8]
Forks have been made from steel, aluminum, carbon fiber, titanium, magnesium, and various combinations. For example, a fork may have carbon fiber blades with an aluminum crown, steerer tube, or fork ends. In rigid forks the material, shape, weight, and design of the forks can noticeably affect the feel and handling of the bicycle.
A stem must be compatible with the dimensions of the fork steerer tube. Steerer tubes come mainly in two common nominal sizes: 25.4 and 28.6 mm (1 and 1 + 1 ⁄ 8 in). Less commonly 31.8 mm ( 1 + 1 ⁄ 4 in) was used on some mountain bikes and tandems and has now returned on some carbon fiber forks, and 38.1 mm ( 1 + 1 ⁄ 2 in) is found on ...
1968 BMW R60US with conventional telescopic fork Telescopic fork in upside down design, with stanchions at the bottom.. Conventional telescopic forks invariably have a pair of fork tubes, or "stanchions", at the top, clamped to a triple tree (also called a triple clamp or a yoke), and the sliders are at the bottom, attached to the front wheel spindle.
On conventional telescopic forks, the lower portion or fork bodies ("fork sliders" in the UK), slide up and down the fork tubes ("fork stanchions" in the UK). The fork tubes must be mirror-smooth to seal the fork oil inside the fork. Some fork tubes, especially on early roadsters and off-road motorcycles, are enclosed in concertina plastic ...
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