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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] |
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] |
Bernhard Rohloff
Bernhard Rohloff is the founder of Rohloff AG and the inventor of several innovative products, amongst other the 14 speed Rohloff Speedhub 500/14 planetary gear hub. Rohloff studied machine-engineering at Olympia while working part-time at Henschel und Thyssen, a German locomotive manufacturer. After graduation, he worked at Mercedes-Benz with development of automobile driveshafts. Rohloff AG Later he struck out on his own and founded Rohloff AG, where he first invented an advanced narrow chain that soon became the industry standard for road-bikes and was used by several Tour de France The Tour de France () is an annual men's multiple-stage bicycle race primarily held in France, while also occasionally passing through nearby countries. Like the other Grand Tours (the Giro d'Italia and the Vuelta a España), it consists ... winners, and the manufacturing methods therefore. He personally designed "the green beast", a proprietary machine for manufacturing SLT-99 chains. R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hub Gears
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] |
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] |
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] |
Bicycle Chain
A bicycle chain is a roller chain that transfers power from the pedals to the drive-wheel of a bicycle, thus propelling it. Most bicycle chains are made from plain carbon or alloy steel, but some are nickel-plated to prevent rust, or simply for aesthetics. History Obsolete chain designs previously used on bicycles included the block chain, the skip-link chain, and the Simpson lever chain. The first chains were of a simple, bushing-less design. These had inherent reliability problems and a bit more friction (and mechanical efficiency losses) than modern chains. With these limitations in mind, the Nevoigt brothers, of the German Diamant Bicycle Company, designed the roller chain in 1898, which uses bushings. More recently, the "bushingless roller chain" design has superseded the bushed chain. This design incorporates the bearing surface of the bushing into the inner side plate, with each plate creating half of the bushing. This reduces the number of parts needed to assemb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuldatal
Fuldatal is a municipality in the district of Kassel, in Hesse, Germany. It is situated along the Fulda River, 5 km northeast of Kassel. Kassel-Rothwesten Airfield Kassel-Rothwesten Airfield is a former military airfield located in Rothwesten, a part of Fuldatal in Germany about north-northeast of Kassel (Hessen); approximately southwest of Berlin. Then known as ''Fliegerhorst Kassel'', the facility ..., a former military airbase and barracks, is located in Fuldatal. References Kassel (district) {{Hesse-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bankrupt
Bankruptcy is a legal process through which people or other entities who cannot repay debts to creditors may seek relief from some or all of their debts. In most jurisdictions, bankruptcy is imposed by a court order, often initiated by the debtor. Bankrupt is not the only legal status that an insolvent person may have, and the term ''bankruptcy'' is therefore not a synonym for insolvency. Etymology The word ''bankruptcy'' is derived from Italian ''banca rotta'', literally meaning "broken bank". The term is often described as having originated in renaissance Italy, where there allegedly existed the tradition of smashing a banker's bench if he defaulted on payment so that the public could see that the banker, the owner of the bench, was no longer in a condition to continue his business, although some dismiss this as a false etymology. History In Ancient Greece, bankruptcy did not exist. If a man owed and he could not pay, he and his wife, children or servants were forced into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surety
In finance, a surety , surety bond or guaranty involves a promise by one party to assume responsibility for the debt obligation of a borrower if that borrower defaults. Usually, a surety bond or surety is a promise by a surety or guarantor to pay one party (the ''obligee'') a certain amount if a second party (the ''principal'') fails to meet some obligation, such as fulfilling the terms of a contract. The surety bond protects the obligee against losses resulting from the principal's failure to meet the obligation. The person or company providing the promise is also known as a "surety" or as a "guarantor". Overview A surety bond is defined as a contract among at least three parties: * the ''obligee'': the party who is the recipient of an obligation * the ''principal'': the primary party who will perform the contractual obligation * the ''surety'': who assures the obligee that the principal can perform the task European surety bonds can be issued by banks and surety companies. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
County
A county is a geographic region of a country used for administrative or other purposes Chambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French denoting a jurisdiction under the sovereignty of a count (earl) or a viscount.The Oxford Dictionary of English Etymology, C. W. Onions (Ed.), 1966, Oxford University Press Literal equivalents in other languages, derived from the equivalent of "count", are now seldom used officially, including , , , , , , , and ''zhupa'' in Slavic languages; terms equivalent to commune/community are now often instead used. When the Normans conquered England, they brought the term with them. The Saxons had already established the districts that became the historic counties of England, calling them shires;Vision of Britai– Type details for ancient county. Retrieved 31 March 2012 many county names derive from the name of the county town (county seat) w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lubrication
Lubrication is the process or technique of using a lubricant to reduce friction and wear and tear in a contact between two surfaces. The study of lubrication is a discipline in the field of tribology. Lubrication mechanisms such as fluid-lubricated systems are designed so that the applied load is partially or completely carried by hydrodynamic or hydrostatic pressure, which reduces solid body interactions (and consequently friction and wear). Depending on the degree of surface separation, different lubrication regimes can be distinguished. Adequate lubrication allows smooth, continuous operation of machine elements, reduces the rate of wear, and prevents excessive stresses or seizures at bearings. When lubrication breaks down, components can rub destructively against each other, causing heat, local welding, destructive damage and failure. Lubrication mechanisms Fluid-lubricated systems As the load increases on the contacting surfaces, distinct situations can be observed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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