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Hub Gear
A hub gear, internal-gear hub, internally geared hub or just gear hub is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed to the elements. Changing the gear ratio was traditionally accomplished by a shift lever connected to the hub with a Bowden cable, and twist-grip style shifters have become common. Hub gear systems generally have a long and largely maintenance-free life though some are not suitable for high-stress use in competitions or hilly, off-road conditions. Many commuter or urban cycles such as European city bikes are now commonly fitted with 7-speed gear-hubs and 8-speed systems are becoming increasingly available. Older or less costly utility bicycles often use 3-speed gear-hubs, such as in bicycle sharing systems. Many folding bicycles use 3-speed gear-hubs. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sturmey-Archer SX3
Sturmey-Archer was a manufacturing company originally from Nottingham, England. It primarily produced bicycle hub gears, brakes and a great many other sundry bicycle components, most prominently during their heyday as a subsidiary of the Raleigh Bicycle Company. In the past, it also manufactured motorcycle hubs, gearboxes and engines. The company was founded in 1902 by Henry Sturmey and James Archer under the guidance of Frank Bowden, the primary owner of Raleigh. In 2000, the assets and trademarks of Sturmey-Archer were sold to Sun Race of Taiwan which was renamed Sun Race Sturmey-Archer Inc. and production moved to Taiwan. Products All Sturmey-Archer gear hubs use epicyclic (planetary) geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mikael Pedersen
Mikael Pedersen (25 October 1855 Fløng – 22 October 1929, Bispebjerg) was a Danish inventor much associated with the English town of Dursley. He is chiefly known today for the highly distinctive Pedersen bicycle. His story is one of rags to riches and back again, and he was largely forgotten in his native country, but fans of the Pedersen bicycle arranged for him to be reburied and a memorial erected at Dursley. Inventions Pedersen invented and patented a novel corn thresher capable of separating corn from chaff, a transmission system, a gear system for horse drawn mills and a braking system for waggons, among other ideas. He was also musical, and although his primary trade was that of a smith, he was listed as a musician in the 1890 census. Pedersen was involved in the development of a continuous centrifuge for the churning and separation of cream and butter from milk - that is, one which did not need to be stopped in order to remove the cream. This separator ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continuously Variable Transmission
A continuously variable transmission (CVT) is an automatic transmission that can change seamlessly through a continuous range of gear ratios. This contrasts with other transmissions that provide a limited number of gear ratios in fixed steps. The flexibility of a CVT with suitable control may allow the engine to operate at a constant RPM while the vehicle moves at varying speeds. CVTs are used in cars, tractors, side-by-sides, motor scooters, snowmobiles, bicycles, and earthmoving equipment. The most common type of CVT uses two pulleys connected by a belt or chain; however, several other designs have also been used at times. Types Pulley-based The most common type of CVT uses a V-belt which runs between two variable-diameter pulleys. The pulleys consist of two cone-shaped halves that move together and apart. The V-belt runs between these two-halves, so the effective diameter of the pulley is dependent on the distance between the two-halves of the pulley. The V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NuVinci Continuously Variable Transmission
Internal CVP shift mechanism Tilting ball variator schematic. The rotating input disk drives rotation of the balls, which drive the rotating output disk. The rotation axis of the balls can be changed in order to change the ratio of input to output speed The NuVinci Continuously Variable Planetary Transmission is a type of roller-based continuously variable transmission (CVT) manufactured and marketed by the American company Fallbrook Technologies Inc. The design saw its initial market application as a bicycle gearing system, first available in December 2006 in the Netherlands and United States. NuVinci CVP technology is also currently under development for other applications, including wind turbines, light electric vehicles, outdoor power equipment, and automotive front-end accessory drives. History Mechanical variators have existed since the 1800s, and they have been used successfully in machinery, particularly the Kopp tilting ball variator. Various attempts have been m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Biking
Mountain biking is a sport of riding bicycles off-road, often over rough terrain, usually using specially designed mountain bikes. Mountain bikes share similarities with other bikes but incorporate features designed to enhance durability and performance in rough terrain, such as air or coil-sprung shocks used as suspension, larger and wider wheels and tires, stronger frame materials, and mechanically or hydraulically actuated disc brakes. Mountain biking can generally be broken down into five distinct categories: cross country, trail riding, all mountain (also referred to as "Enduro"), downhill, and freeride. This sport requires endurance, core strength and balance, bike handling skills, and self-reliance. Advanced riders pursue both steep technical descents and high incline climbs. In the case of freeride, downhill, and dirt jumping, aerial maneuvers are performed off both natural features and specially constructed jumps and ramps. Mountain bikers ride on off-road trails ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rohloff Speedhub
The Rohloff Speedhub is an epicyclic internal hub gear for bicycles, developed and patented by Rohloff AG. It has been manufactured and marketed by that company since 1998. The Speedhub 500/14 has 14 equally spaced, sequential, non-overlapping gear ratios operated by a single twistgrip. The overall gear range is 526%, meaning the highest gear is 5.26 times as high as the lowest gear. Individual gear shifts when shifting up give an increase of about 13.6% (equivalent to a decrease of about 12.0% when shifting down). The Speedhub is more expensive than competing bicycle gear systems (both hub gears and derailleur gears), and it is some 100 grams heavier than a comparable set of derailleur gears, but offers about the same gear range (and at its ratio of 5.26:1 more range than a typical road bike ratio of 4.28:1 with 50/34 chainrings and 11 to 32 tooth cassette) while requiring significantly less maintenance and having a longer service life. It is therefore mainly used in exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rohloff
Rohloff AG is a German company from Fuldatal near Kassel that manufactures hub gears, bicycle chains and tools that are known for their durability and high performance. The company’s logo is a black silhouette of a raven on a yellow background. History Rohloff AG was founded in 1986 and began by producing a high-tech and very expensive bicycle chain, the SLT 99. Sales of this chain generated revenues of €1m in 1991, and approximately €0,5m annually from 1992-1998. Development of Rohloff Speedhub 500/14 While at the Tour de France road race in France in 1994, the Rohloffs went bicycling on the beach in France. The bikes got stuck in the sand, and the primitive derailleur gear systems would not work. This triggered Bernhard Rohloff to develop a new internally geared hub. On the 1996 IFMA in Cologne, Rohloff announced a 14-speed gear hub with a weight of 1700 grams. At the time, the gear hub with the greatest number of speeds was the fragile 3700 gram 12 speed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sachs Elan
The Sachs Elan was an epicyclic internal hub gear for bicycles, developed and manufactured by the bicycle division of the German company Fichtel & Sachs. It was considered heavy and production units were plagued with quality issues. The gear hub was discontinued before the turn of the 2000 millennium. History The Elan was introduced in 1995 and manufactured until 1998. With its 12 speeds and an overall range of 339%DEALER TECHNICAL MANUAL , SRAM, 1999 it was the most advanced epicyclic hub gear at the time, and the first hub gear commercially available with more than 7 speeds. After took over ownership of the German bicycle component manufacturer, the Elan was sold under ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuvinci Internals
Internal CVP shift mechanism Tilting ball variator schematic. The rotating input disk drives rotation of the balls, which drive the rotating output disk. The rotation axis of the balls can be changed in order to change the ratio of input to output speed The NuVinci Continuously Variable Planetary Transmission is a type of roller-based continuously variable transmission (CVT) manufactured and marketed by the American company Fallbrook Technologies Inc. The design saw its initial market application as a bicycle gearing system, first available in December 2006 in the Netherlands and United States. NuVinci CVP technology is also currently under development for other applications, including wind turbines, light electric vehicles, outdoor power equipment, and automotive front-end accessory drives. History Mechanical variators have existed since the 1800s, and they have been used successfully in machinery, particularly the Kopp tilting ball variator. Various attempts have been m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NuVinci
Internal CVP shift mechanism Tilting ball variator schematic. The rotating input disk drives rotation of the balls, which drive the rotating output disk. The rotation axis of the balls can be changed in order to change the ratio of input to output speed The NuVinci Continuously Variable Planetary Transmission is a type of roller-based continuously variable transmission (CVT) manufactured and marketed by the American company Fallbrook Technologies Inc. The design saw its initial market application as a bicycle gearing system, first available in December 2006 in the Netherlands and United States. NuVinci CVP technology is also currently under development for other applications, including wind turbines, light electric vehicles, outdoor power equipment, and automotive front-end accessory drives. History Mechanical variators have existed since the 1800s, and they have been used successfully in machinery, particularly the Kopp tilting ball variator. Various attempts have been m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Derailleur Gears
Shimano 600 front derailleur (1980) A derailleur is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another. Modern front and rear derailleurs typically consist of a moveable chain-guide that is operated remotely by a Bowden cable attached to a shifter mounted on the down tube, handlebar stem, or handlebar. When a rider operates the lever while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets. Etymology ''Dérailleur'' is a French word, derived from the derailment of a train from its tracks. Its first recorded use was 1930. History A modern road bicycle drivetrain with front and rear derailleurs Various derailleur systems were designed and built in the late 19th century. One example is the Protean two-speed derailleur available on the Whippet safety bicycle. The French bicycl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wanderer (car)
Wanderer was a German manufacturer of bicycles, motorcycles, automobiles, vans and other machinery. Established as ''Winklhofer & Jaenicke'' in 1896 by Johann Baptist Winklhofer and Richard Adolf Jaenicke, the company used the ''Wanderer'' brand name from 1911, making civilian automobiles until 1941 and military vehicles until 1945. Today the brand is part of the Zweirad Einkaufs Genossenschaft (ZEG). History ''Winklhofer & Jaenicke'' was established in 1896 in Chemnitz. It built motorcycles from 1902 and automobiles from 1903. The ''Wanderer'' brand was chosen in 1911 for overseas exports and was soon adopted for domestic sales. The first two- or three-seater models used four-cylinder 1145 cc and 1220 cc engines. The 1220 cc model lasted until 1925. The first six-cylinder model appeared in 1928. By 1926, when Wanderer introduced a successful ''Typ'' 10, the company was making 25 vehicles a day; parts were made at the old plant in Chemnitz and assembled at the 1927 built ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
