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The three-speed bicycle is a bicycle that uses internal hub gears at the rear wheel hub to provide three gear ratios. Three-speed hubs have been in use since the early 1900s. Though they are heavier than comparable derailleur systems, internal-gear hub systems generally last longer and require less maintenance.
Unlike most "waterproof breathable" fabrics, Analogy can pass out liquid water as well as vapour. Unlike a conventional waterproof fabric, Analogy would fail a hydrostatic head test (if used to seal the bottom of a tube containing water, only a very short column could be supported). However, like fur, Analogy causes water to flow away from the ...
Sturmey-Archer AW 3-speed hub. The Raleigh "Twenty" was originally fitted with 20" × 1-3/8" wheels and tyres (ISO 35-451), but most export versions were sold with 20" × 1.75" wheels and tyres (ISO 47-406) – the same as BMX bicycles. Many were sold as either single speed with coaster brake or fitted with a Sturmey-Archer AW three-speed hub ...
The outfits differ from the clothes worn in other forms of cycling, such as commuting and recreational cycling (for which people are likely to wear ordinary street clothes, [1] perhaps with a coat or rain cape [2]). Competitive kit uses technical and performance materials and features to improve efficiency and comfort.
As of September 2018, she holds the world record for paced bicycle land speed [1] [2] and is considered "the fastest cyclist on earth". [ 3 ] [ 4 ] She set the record on September 16, 2018, at the Bonneville Salt Flats in Utah, by traveling an average of 183.932 mph (296.009 km/h) on a custom-built carbon KHS bicycle behind a custom-built ...
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Bicycles parked outside an academic building at Stanford University Firefighter bicycle. The main categories of bicycles concerning their intended use are: Road bicycles are designed for traveling at speed on paved roads. Touring bicycles are designed for bicycle touring and long journeys. They are durable and comfortable, capable of ...
From a mechanical viewpoint, up to 99% of the mechanical energy delivered by the rider into the pedals is transmitted to the wheels (clean, lubricated new chain at 400 W), although the use of gearing mechanisms reduces this by 1–7% (clean, well-lubricated derailleurs and a straight chainline), 4–12% (chain with 3-speed hubs), or 10–20% (shaft drive with 3-speed hubs).