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Cross-country Mountain Biking
Cross-country (XC) cycling is a discipline of mountain biking. Cross-country cycling became an Olympic sport in 1996 and is the only form of mountain biking practiced at the Olympics. Terrain Cross-country cycling is defined by the terrain on which it is performed. XC courses and trails consist of a mix of rough forest paths and singletrack (also referred to as doubletrack depending on width), smooth fireroads, and even paved paths connecting other trails. Until recently cross-country trails were deemed "easy" or "intermediate", due to the concept that this discipline of mountain biking relies more on physical ability than technical prowess. Bikes and equipment Cross-country bicycles are some of the lightest mountain bikes, typically between . They usually feature suspension forks in front and often have suspension in the rear. In both the front and rear, most XC bicycles have approximately of suspension travel in the front and 120 millimeters in the rear. The geometry of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Biker 04
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least above the surrounding land. A few mountains are inselberg, isolated summits, but most occur in mountain ranges. mountain formation, Mountains are formed through tectonic plate, tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through Slump (geology), slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce Alpine climate, colder climates than at sea level at similar latitude. These colder climates strongly affect the Montane ecosystems, ecosystems of mountains: different elevations hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
650b
A bicycle wheel is a wheel, most commonly a wire wheel, designed for a bicycle. A pair is often called a wheelset, especially in the context of ready built "off the shelf" performance-oriented wheels. Bicycle wheels are typically designed to fit into the frame and fork via dropouts, and hold bicycle tires. Invention The first wheel to use the tension in metal spokes was invented by Sir George Cayley to achieve lightness in his 1853 glider. Construction The first bicycle wheels followed the traditions of carriage building: a wooden hub, a fixed steel axle (the bearings were located in the fork ends), wooden spokes and a shrink fitted iron tire. A typical modern wheel has a metal hub, wire tension spokes and a metal or carbon fiber rim which holds a pneumatic rubber tire. Hub A hub is the center part of a bicycle wheel. It consists of an axle, bearings and a hub shell. The hub shell typically has two machined metal flanges to which spokes can be attached. Hub shells can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
29er (bicycle)
29ers or two-niners are mountain bikes and hybrid bikes that are built to use 700c or 622 mm ISO (inside rim diameter) wheels, commonly called 29″ wheels. Most mountain bikes once used ISO 559 mm wheels, commonly called 26″ wheels. The ISO 622 mm wheel is typically also used for road-racing, trekking, cyclo-cross, touring and hybrid bicycles. In some countries, mainly in Continental Europe, ISO 622 mm wheels are commonly called 28″ wheels or "28 Incher". Origins 29er rims have an interior diameter of and the average 29″ mountain bike tire is (in ISO notation) 59-622 – corresponding to an outside diameter of about . The typical 26″ MTB tire has a rim diameter of and an outside tire diameter of about . In the early 1980s, the size of the wheels for the emerging mountain bikes was undecided. So when English off-road cycling pioneer Geoff Apps contacted Gary Fisher and Charlie Kelly with news that he had built a prototype off-road bicycle tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Four-cross
Four-cross (4X), also called mountain-cross, not to be confused with fourcross, is a relatively new style of mountain bike racing where four bikers race downhill on a prepared, BMX-like track, simply trying to get down first. These bikes are generally either full suspension with 140mm to 160mm of travel, or hardtails, and typically have relatively strong frames. They run a chainguide on front and gears on the back. They have slack head angles, short chainstays and low bottom brackets for good cornering and acceleration. In recent years the tracks raced on have been rougher and less like those used in BMX. Four-cross was added to the UCI Mountain Bike World Cup and the UCI Mountain Bike & Trials World Championships in 2002, replacing dual slalom. It was removed from the World Cup following the 2011 series. A replacement world series, the 4X Pro Tour, was launched in 2012. The four-cross events were removed from the World Championship after the 2021 edition. See also *Mountain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Cycling
British Cycling (formerly the British Cycling Federation) is the main national sport governing body, governing body for cycle sport in United Kingdom, Great Britain. It administers most competitive cycling in Great Britain, the Channel Islands and the Isle of Man. It represents Britain at the world body, the Union Cycliste Internationale (UCI) and selects national teams, including the Great Britain (GB) Cycling Team for races in Britain and abroad. , it has a total membership of 165,000. It is based at the Manchester Velodrome, National Cycling Centre on the site of the 2002 Commonwealth Games in Manchester. History The British Cycling Federation (BCF) was formed in 1959 at the end of an administrative dispute within the sport. The governing body since 1878 had been the National Cyclists Union (NCU).The NCU took over control of cycling from the Amateur Athletics Association. It was originally called the Bicycle Union. It became the NCU in 1883. The legality of cyclists on the ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USA Cycling
USA Cycling or USAC, based in Colorado Springs, Colorado, is the national governing body for bicycle racing in the United States. It covers the disciplines of road, track, mountain bike, cyclo-cross, and BMX across all ages and ability levels. In 2015, USAC had a membership of 61,631 individual members. USA Cycling is associated with the UCI or, Union Cycliste Internationale, which governs international cycling, and the United States Olympic Committee (USOC). The organization is also a member of the continental body Confederacion Panamericana de Ciclismo (COPACI). USA Cycling also organizes the USA Cycling Pro Road Tour, the top road cycling series for men and women in the United States. History The Amateur Bicycle League of America was organized in 1920 and incorporated in New York in 1921. In 1975, the name was changed to the United States Cycling Federation. In 1995, USA Cycling, Inc. was incorporated in Colorado, and in 1995, the two corporations merged, with USA Cyclin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NORBA
Norba, an ancient town of Latium (''Adjectum''), Italy. It is situated 1 mile northwest of the modern town of Norma, on the western edge of the Volscian Mountains or Monti Lepini. The town is perched above a precipitous cliff with a splendid view over the Pomptine Marshes below; the highest point stands to ca. 460 meters (over 1500 feet) above sea level. History Norba was a member of the Latin League of 499 BC. It became a Roman colony in 492 BC, initially to protect the border with the Volsci, and later serving as an important fortress guarding the Pomptine Marshes. It served in 199 BC as a place of detention for the Carthaginian hostages, and was captured and destroyed by Sulla's troops during the civil wars at the end of 82 BC. By the first century AD Norba is included by Pliny the Elder on his list of extinct cities in Latium. Archaeology From excavations begun in 1901 it seems clear that the remains now visible on the site are entirely Roman. The well-preserved w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Cycliste Internationale
The Union Cycliste Internationale (; UCI; ) is the world governing body for sports cycling and oversees international competitive cycling events. The UCI is based in Aigle, Switzerland. The UCI issues racing licenses to riders and enforces disciplinary rules, such as in matters of doping. The UCI also manages the classification of races and the points ranking system in various cycling disciplines including road and track cycling, mountain biking, cyclo-cross, Gravel, and BMX, for both men and women, amateur and professional. It also oversees the World Championships. After the 2022 Russian invasion of Ukraine, the UCI said that Russian and Belarusian teams were forbidden from competing in international events. It also stripped both Russia and Belarus of scheduled events. History The UCI was founded on 14 April 1900 in Paris by the national cycling sports organisations of Belgium, the United States, France, Italy, and Switzerland. It replaced the International Cycl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
24 Hours Of Le Mans
The 24 Hours of Le Mans () is an endurance-focused Sports car racing, sports car race held annually near the city of Le Mans, France. It is widely considered to be one of the world's most prestigious races, and is one of the races—along with the Monaco Grand Prix and Indianapolis 500—that form the Triple Crown of Motorsport, and is also one of the races alongside the 24 Hours of Daytona and 12 Hours of Sebring that make up the informal Triple Crown of endurance racing. Run since 1923, it is the oldest active Endurance racing (motorsport), endurance racing event in the world. Unlike fixed-distance races whose winner is determined by minimum time, the 24 Hours of Le Mans is won by the car that covers the greatest distance in 24 hours. The cars on this track are able to achieve speeds of , and reached on the Mulsanne Straight 1988 24 Hours of Le Mans#Statistics, in 1988instigating the addition of more chicanes to the track to reduce speed reached. Racing teams must balance th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
