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Bicycle Helmet
A bicycle helmet is a type of helmet designed to attenuate impacts to the head of a cyclist in falls while minimizing side effects such as interference with peripheral vision. There is ongoing scientific research into the degree of protection offered by bicycle helmets in the event of an accident, and the effects of helmet wearing on cyclist and motor vehicle driver behaviour. There is active debate over what can be concluded from available studies, and on whether the use of helmets by cyclists should be promoted or mandated, either just for children, or for cyclists of all ages. In particular the debate over bicycle helmet laws has been intense and occasionally bitter, often based not only on differing interpretations of the scientific and other academic literature, but also on differing assumptions and interests of various parties. History History of designs A cycle helmet should generally be light in weight and provide ample ventilation because cycling can be an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bicycle Helmet Laws
Some countries and lower jurisdictions have enacted laws or regulations which require cyclists to wear a helmet in certain circumstances, typically when riding on the road or a road-related area (such as a bicycle lane or path). In some places this requirement applies only to children under a certain age, while in others it applies to cyclists of all ages. Research indicates that bicycle helmet laws reduce bicycle fatalities and injuries. Large increases in the rate of helmet wearing usually take place after helmet laws are passed. Evidence is mixed as to whether the helmet laws lead to less cycling. Background Modern varieties of bicycle helmet first became commercially successful from 1975. Industry helmet standards were developed from the 1970s and are still under development. Even before then, there had been calls for riders to wear helmets, based on the assumptions of high risk to cyclists and effectiveness of helmets in preventing serious injury. The Royal Australasian C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Types Of Bicycle Helmets
Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS command), a command to display contents of a file. * Type (Unix), a command in POSIX shells that gives information about commands. * Type safety, the extent to which a programming language discourages or prevents type errors. * Type system, defines a programming language's response to data types. Mathematics * Type (model theory) * Type theory, basis for the study of type systems * Arity or type, the number of operands a function takes * Type, any proposition or set in the intuitionistic type theory * Type, of an entire function ** Exponential type Biology * Type (biology), which fixes a scientific name to a taxon * Dog type, categorization by use or function of domestic dogs Lettering * Type is a design concept for lettering used in typography which helped bring about modern textual pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polycarbonate
Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code (RIC) and are identified as "Other", 7 on the RIC list. Products made from polycarbonate can contain the precursor monomer bisphenol A (BPA). Structure Carbonate esters have planar OC(OC)2 cores, which confers rigidity. The unique O=C bond is short (1.173 Å in the depicted example), while the C-O bonds are more ether-like (the bond distances of 1.326 Å for the example depicted). Polycarbonates received their name because they are polymers containing carbonate groups (−O−(C=O)−O−). A balance of useful features, including temperature resistance, impact resistance and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Which?
''Which?'' is a United Kingdom brand name that promotes informed consumer choice in the purchase of goods and services by testing products, highlighting inferior products or services, raising awareness of consumer rights and offering independent advice. The brand name is used by the Consumers' Association, a registered charity and company limited by guarantee that owns several businesses, including ''Which? Financial Services Limited'' (''Which? Mortgage Advisers''), ''Which? Legal Limited'' and ''Which? Limited'', which publishes the ''Which?'' Papers. The vast majority of the association's income comes from the profit it makes on its trading businesses, for instance subscriptions to ''Which?'' magazine, which are donated to the campaigning part of the organisation to fund advocacy activity and inform the public about consumer issues. ''Which?'' magazine maintains its independence by not accepting advertising, and the organisation receives no government funding. The Consumer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snell Memorial Foundation
The Snell Memorial Foundation is a nonprofit organization created to provide a high quality standard of safety for helmets. Founded in 1957, the foundation is named after William "Pete" Snell, a popular sports car racer who died in 1956 of head injuries he received when the racing helmet he wore failed to protect his head. A group of friends, scientists, physicians, and others joined together to create a group that would promote research and education as well as test and develop standards to improve the effectiveness of helmets. Standards *B-95 Bicycle helmets *B-95C Children's bicycle helmets *E2001 Equestrian helmets *H2000 Harness racing helmets *L-98 Mopeds and Low Powered Vehicles *M2015 Motorcycle helmets *M2020 Helmet Standard for Motorcycling *N-94 Undefined or general use helmets used in sports and industry *RS-98 Recreational Skiing & Snowboarding helmets *SA2005 Auto racing helmets *SA2015 — 2015 Helmet Standard For Use in Competitive Automotive Sports *S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triathlon
A triathlon is an endurance multisport race consisting of swimming, cycling, and running over various distances. Triathletes compete for fastest overall completion time, racing each segment sequentially with the time transitioning between the disciplines included. The word is of Greek origin, from τρεῖς or ''treis'' (three) and ἆθλος or ''athlos'' (competition). The sport originated in the late 1970s in Southern California as sports clubs and individuals developed the sport. This history has meant that variations of the sport were created and still exist. It also led to other three-stage races using the name triathlon despite not being continuous or not consisting of swim, bike, and run elements. Triathletes train to achieve endurance, strength and speed. The sport requires focused persistent and periodised training for each of the three disciplines, as well as combination workouts and general strength conditioning. History The evolution of triathlon as a dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Individual Time Trial
An individual time trial (ITT) is a road bicycle race in which cyclists race alone against the clock (in French: ''contre la montre'' – literally "against the watch", in Italian: ''tappa a cronometro'' " stopwatch stage"). There are also track-based time trials where riders compete in velodromes, and team time trials (TTT). ITTs are also referred to as "the race of truth", as winning depends only on each rider's strength and endurance, and not on help provided by teammates and others riding ahead and creating a slipstream. Individual time trial are usually held on flat or rolling terrain, although sometimes they are held up a mountain road (in Italian: ''cronoscalata'' "chrono climbing"). Sometimes the opening stage of a stage race is a very short individual time trial called a prologue (8 km or less for men, 4 km or less for women and juniors). Starting times are at equal intervals, usually one or two minutes apart. The starting sequence is usually based on the finishing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streamliner
A streamliner is a vehicle incorporating streamlining in a shape providing reduced air resistance. The term is applied to high-speed railway trainsets of the 1930s to 1950s, and to their successor " bullet trains". Less commonly, the term is applied to fully faired upright and recumbent bicycles. As part of the Streamline Moderne trend, the term was applied to passenger cars, trucks, and other types of light-, medium-, or heavy-duty vehicles, but now vehicle streamlining is so prevalent that it is not an outstanding characteristic. In land speed racing, it is a term applied to the long, slender, custom built, high-speed vehicles with enclosed wheels. Trains Before World War II Europe The first high-speed streamliner in Germany was the " Schienenzeppelin", an experimental propeller driven single car, built in 1930. On 21 June 1931, the car set a speed record of on a run between Berlin and Hamburg. In 1932 the propeller was removed and a hydraulic system installed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Sports Inc
A bell is a directly struck idiophone percussion instrument. Most bells have the shape of a hollow cup that when struck vibrates in a single strong strike tone, with its sides forming an efficient resonator. The strike may be made by an internal "clapper" or "uvula", an external hammer, or—in small bells—by a small loose sphere enclosed within the body of the bell (jingle bell). Bells are usually cast from bell metal (a type of bronze) for its resonant properties, but can also be made from other hard materials. This depends on the function. Some small bells such as ornamental bells or cowbells can be made from cast or pressed metal, glass or ceramic, but large bells such as a church, clock and tower bells are normally cast from bell metal. Bells intended to be heard over a wide area can range from a single bell hung in a turret or bell-gable, to a musical ensemble such as an English ring of bells, a carillon or a Russian zvon which are tuned to a common scale and ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giro (company)
Giro is a U.S. manufacturer of snow and cycling helmets, snow & MTB goggles, cycling and mountain bike apparel and shoes, as well as softgoods for cycling, skiing and snowboarding. The company was founded in 1985 by Jim Gentes and is headquartered in the Scotts Valley, California area. It was acquired by Bell Sports Bell Sports is an American maker of bicycle and motorcycle helmets. The company is a subsidiary of Vista Outdoor, after BRG Sports –owner of Riddell football helmets– sold some of its brands (including Bell, Giro, C-Preme, and Blackburn) to ... in 1996. Giro is part of Vista Outdoor. References External links * Clothing companies established in 1985 Cycle parts manufacturers Companies based in Santa Cruz County, California American companies established in 1985 {{cycle-manufacturer-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Fiber
Carbon fiber-reinforced polymers (American English), carbon-fibre-reinforced polymers (Commonwealth English), carbon-fiber-reinforced plastics, carbon-fiber reinforced-thermoplastic (CFRP, CRP, CFRTP), also known as carbon fiber, carbon composite, or just carbon, are extremely strong and light fiber-reinforced plastics that contain carbon fibers. CFRPs can be expensive to produce, but are commonly used wherever high strength-to-weight ratio and stiffness (rigidity) are required, such as aerospace, superstructures of ships, automotive, civil engineering, sports equipment, and an increasing number of consumer and technical applications. The binding polymer is often a thermoset resin such as epoxy, but other thermoset or thermoplastic polymers, such as polyester, vinyl ester, or nylon, are sometimes used. The properties of the final CFRP product can be affected by the type of additives introduced to the binding matrix (resin). The most common additive is silica, but other a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
