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Bicycle Helmet
A bicycle helmet is a type of helmet designed to attenuate impacts to the head of a cycling, cyclist in collisions while minimizing side effects such as interference with peripheral vision. History History of designs A cycle helmet should generally be light in weight and provide ample ventilation because cycling can be an intense aerobic exercise, aerobic activity which significantly raises body temperature, and the head in particular needs to be able to regulate its temperature. The dominant form of the helmet up to the 1970s was the "hairnet" style, an open construction made of rubber bars covered in leather. This offered acceptable protection from scrapes and cuts, but only minimal impact protection, and was mainly used by Bicycle racing, racing cyclists. More widespread use of helmets began in the US in the 1970s. After many decades when bicycles were regarded largely as children's toys, many American adults took up cycling during and after the bike boom of the ... [...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#Order and type, 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 b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polycarbonate
Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate ester, carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, toughness, tough materials, and some grades are optically transparent. They are easily worked, injection molding, molded, and thermoforming, thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code, 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 confer 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 ester, carbonate groups (−O−( ... [...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? Limited, which publishes the ''Which?'' magazines, and the currently dormant Which? Financial Services Limited (''Which?'' Mortgage and Insurance Advisers operated until 2019) and Which? Legal Limited. 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 organ ... [...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 *SA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean. The United States asserts sovereignty over five Territories of the United States, major island territories and United States Minor Outlying Islands, various uninhabited islands in Oceania and the Caribbean. It is a megadiverse country, with the world's List of countries and dependencies by area, third-largest land area and List of countries and dependencies by population, third-largest population, exceeding 340 million. Its three Metropolitan statistical areas by population, largest metropolitan areas are New York metropolitan area, New York, Greater Los Angeles, Los Angel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triathlon
A triathlon is an endurance multisport race consisting of Swimming (sport), swimming, Cycle sport, 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 language, Greek origin, from (), 'three', and (), 'competition'. The sport originated in the late 1970s in Southern California as sports clubs and individuals developed the sport. This history has meant that #Nonstandard variations, 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 Sports periodization, periodised training for each of the three disciplines, as well as combination workouts and general strength conditio ... [...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 trials 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 * Germany, 1930: 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 h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Sports Inc
A bell /ˈbɛl/ () 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 s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giro (company)
Giro is an American manufacturer of snow and cycling helmets; snow and mountain-biking goggles; cycling and mountain bike apparel and shoes; and softgoods for cycling Cycling, also known as bicycling or biking, is the activity of riding a bicycle or other types of pedal-driven human-powered vehicles such as balance bikes, unicycles, tricycles, and quadricycles. Cycling is practised around the world fo ..., skiing and snowboarding. The company was founded in 1985 by Jim Gentes and was headquartered in Scotts Valley, California. It was acquired by Bell Sports in 1996. Giro is now part of Revelyst and is based at Revelyst’s offices in Irvine, CA. Giro and Bell Sports were previously owned by Vista Outdoor and had been purchased along with other brands for $400 million in 2016. In 2023, Vista Outdoor announced that the facility in Scotts Valley, California that serves as the base for Giro would be closed. Numerous relevant employees were laid off. That action had pa ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tour De France
The Tour de France () is an annual men's multiple-stage cycle sport, bicycle race held primarily in France. It is the oldest and most prestigious of the three Grand Tour (cycling), Grand Tours, which include the Giro d'Italia and the Vuelta a España. The race was first organized in 1903 Tour de France, 1903 to increase sales for the newspaper ''L'Auto'' (which was an ancestor of ''L'Équipe'') and has been held annually since, except when it was not held from 1915 to 1918 and 1940 to 1946 due to the two World war, World Wars. As the Tour gained prominence and popularity, the race was lengthened and gained more international participation. The Tour is a UCI World Tour event, which means that the teams that compete in the race are mostly UCI WorldTeams, with the exception of the teams that the organizers invite. Traditionally, the bulk of the race is held in July. While the route changes each year, the format of the race stays the same and includes time trials, passage through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
