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2. Harley-Davidson Model 7D - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Model_7D

   Ignition was via a magneto, and the engine was started using bicycle-style pedals. Instead of a conventional clutch, a pulley belt tensioner could be moved, allowing the leather drive belt to slip. [1] Touting its effective muffler, Harley-Davidson advertised the 7D, and the other Harleys of this era, as "The Silent Gray Fellow."

3. Belt-driven bicycle - Wikipedia

   en.wikipedia.org/wiki/Belt-driven_bicycle

   The Bridgestone Picnica belt-drive bicycle was introduced in the early 1980s. It used a tooth-belt drive like auto timing belts and Harley-Davidson drive belts, along with a novel two-part chainring that increased belt tension with increasing load. The Picnica was a folding bicycle, and part of the

4. Toothed belt - Wikipedia

   en.wikipedia.org/wiki/Toothed_belt

   Toothed belt. A toothed belt, timing belt, cogged belt, cog belt, or synchronous belt is a flexible belt with teeth moulded onto its inner surface. Toothed belts are usually designed to run over matching toothed pulleys or sprockets. Toothed belts are used in a wide array of mechanical devices where high power transmission is desired.

5. Tensioner - Wikipedia

   en.wikipedia.org/wiki/Tensioner

   Tensioner. A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a spring-loaded bicycle chain tensioner, the tension it creates. The force may be generated by a fixed displacement, as in the case of ...

6. Harley-Davidson Sportster - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Sportster

   The Harley-Davidson Sportster is a line of motorcycles produced continuously since 1957 by Harley-Davidson. Sportster models are designated in Harley-Davidson's product code by beginning with "XL". In 1952, the predecessors to the Sportster, the Model K Sport and Sport Solo motorcycles, were introduced. These models K, KK, KH, and KHK of 1952 ...

7. List of Harley-Davidson motorcycles - Wikipedia

   en.wikipedia.org/wiki/List_of_Harley-Davidson...

   Single-downtube bicycle-like frame, direct leather belt drive, rear coaster brake. Construction began in 1903; sold as production models in 1904–1905. Models 2, 3 (Named retroactively in 1908) 26.8 cu in (439 cc) IOE single. 1906–1907. Dual-spring front-end suspension. Model 4. 26.8 cu in (439 cc) IOE single. 1908.