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Fixed-gear
A fixed-gear bicycle (or fixed-wheel bicycle, commonly known in some places as a fixie) is a bicycle that has a drivetrain with no freewheel mechanism. The freewheel was developed early in the history of bicycle design but the fixed-gear bicycle remained the standard track racing design. More recently the "fixie" has become a popular alternative among mainly urban cyclists, offering the advantage of simplicity compared with the standard multi-geared bicycle. Most bicycle hubs incorporate a freewheel to allow the pedals to remain stationary while the bicycle is in motion, so that the rider can coast, i.e., ride without pedalling using forward momentum. A fixed-gear drivetrain has the drive sprocket (or cog) threaded or bolted directly to the hub of the back wheel, so that the pedals are directly coupled to the wheel. During acceleration, the pedal crank drives the wheel, but in other situations, the rear wheel can drive the pedal cranks. This direct coupling allows a cyclist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-speed Bicycle
A single-speed bicycle is a type of bicycle with a single gear ratio. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. There are many types of modern single speed bicycles; BMX bicycles, most bicycles designed for children, cruiser type bicycles, classic commuter bicycles, unicycles, bicycles designed for track racing, fixed-gear road bicycles, and single-speed mountain and cyclocross bikes. Although most fixed-gear bicycles (fixies) are technically single speed, the term single-speed generally refers to a single gear ratio bicycle with a freewheel mechanism to allow it to coast. Vis-à-vis multi-speed bicycles Advantages A single-speed bicycle is generally cheaper, lighter, and mechanically simpler than its multi-geared equivalent. Without derailleurs or other gearing systems, there are fewer parts on the bicycle that require maintenance, making this type of cycle useful for city commuting in all wea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bicycle
A bicycle, also called a pedal cycle, bike or cycle, is a human-powered transport, human-powered or motorized bicycle, motor-powered assisted, bicycle pedal, pedal-driven, single-track vehicle, having two bicycle wheel, wheels attached to a bicycle frame, frame, one behind the other. A is called a cyclist, or bicyclist. Bicycles were introduced in the 19th century in Europe. By the early 21st century, more than 1 billion were in existence. These numbers far exceed the number of cars, both in total and ranked by the number of individual models produced. They are the principal means of transportation in many regions. They also provide a popular form of recreation, and have been adapted for use as children's toys, Physical fitness, general fitness, military and police applications, courier services, bicycle racing, and bicycle stunts. The basic shape and configuration of a typical Safety bicycle, upright or "safety bicycle", has changed little since the first Chain drive, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alf Engers
Alfred Robert Engers (born 1 June 1940) is an English former racing cyclist who set national records and won national individual time trial championships from 1959 to the late 1970s. He established a British record of 49 minutes and 24 seconds in 1978, averaging 30.364 mph (49.190 km/h). He was the first rider to beat 50 minutes and thus the first to average more than . Background Engers was born in Southgate in North London. He worked night shifts as a pastry cook in Whitechapel while pursuing his cycling career. He first got a bike at 10. It weighed on his bakery scales. He was a runner and swimmer at school but could do neither well after an operation to his kneecap after a fall from his bike when he was 14. The operation removed his right kneecap and tied the ligaments together. He was expelled from school for "misbehaving on every level" and received his first Road Time Trials Council (RTTC) official written warning at 16.Hilton, T. (2004), ''One More ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Artistic Cycling
Artistic cycling is a form of competitive indoor cycling in which athletes perform tricks (called exercises) for points on specialized, fixed-gear bikes in a format similar to ballet or gymnastics. The exercises are performed in front of judges in five-minute roundsAbout Indoor Cycling Artistic Cycling, UCI, Retrieved 18 April 2021 by singles, pairs, four- or six-person teams. History The first unofficial world championships in artistic cycling was held in 1888 by Swiss-American Nicholas Edward Kaufmann and was largely a publicity stunt to showcase his trick bicycling. The first official world championships were held for men in 1956 and for women in 1970.Bikes The bicycles used for artistic cycling are a form of[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road Bicycle
The term road bicycle is used to describe bicycles built for traveling at speed on paved roads. Some sources use the term to mean racing bicycle. Other sources specifically exclude racing bicycles from the definition, using the term to mean a bicycle of a similar style but built more for endurance and less the fast bursts of speed desired in a racing bicycle; as such, they usually have more gear combinations and fewer hi-tech racing features. Certain of these bicycles have been referred to as 'sportive' bicycles to distinguish them from racing bicycles. Compared to other styles of bicycle, road bicycles share common features: * The tires are narrow, high-pressure ( or higher), and smooth to decrease rolling resistance * The handlebars are bent ("dropped") to allow the rider position to be leaned forward and downward, which reduces the forward vertical cross sectional area and thus highly reduces the air resistance * They usually use derailleur gears; however, single-speed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bicycle Drivetrain Systems
Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios. History The history of bicycle drivetrain systems is closely linked to the history of the bicycle. Major changes in bicycle form have often been initiated or accompanied by advances in drivetrain systems. Several early drivetrains used straight-cut gears that meshed directly with each other outside of the hub. Some bicycles have used a double-sided rear wheel, with different-sized sprockets on each side. To change gears, the rider would stop and dismount, remove the rear wheel and reinstall it in the reverse direction. Derailleur systems were first developed in the late 19th century, but the modern cable-operated parallelogram derailleur was invented in the 1950s. * Draisine * Penny-farthing * Safety bicycle Power col ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detangler
The detangler, Gyro or rotor is an invention for the freestyle BMX bicycle, allowing the handlebars to turn a complete 360° rotation without the brake cables getting tangled up. A detangler is usually only used for the rear brake cable. The front brake cable can be routed through the stem, via a hollow stem bolt known as a Pott's mod bolt, and fork steer tube to avoid the tangling problem. How it works The single cable from the handlebar's rear brake lever divides into two cables which are routed to opposite sides of the stem or fork steer tube and into cable stops. The inner cables connect to metal tabs on a disc attached to the upper side of a thrust bearing placed around the stem or steer tube. Squeezing the brake lever pulls the inner cables and causes the bearing assembly to rise. A second disc is attached to the bottom of the thrust bearing such that the entire assembly moves together up and down the steering axis while each disc can rotate independently around th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Montreal Mirror
''Montreal Mirror'' or just ''Mirror'' was a free English language alternative newsweekly based in Montreal, Quebec, Canada which was distributed every Thursday. It had a circulation of 70,000 and reached a quarter of a million readers per week. First published on June 20, 1985, the publication became a weekly in September 1989. It was bought by media giant Quebecor in 1997. It was published by ''Communications Gratte-Ciel Ltée''. On June 22, 2012, Sun Media (the division of Quebecor that the Mirror belonged to) announced that the paper would be ceasing publication effective immediately. See also * List of newspapers in Canada * Ken Hechtman References External links ''Montreal Mirror'' (official website)(via the Internet Archive) Company profile - Verified Audit Circulation (via the Internet Archive) {{Quebecor Alternative weekly newspapers published in Canada Newspapers published in Montreal English-language newspapers published in Quebec Publications established in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Plate, North American Tectonic Plate, Greenland is included as a part of North America geographically. North America covers an area of about , about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the list of continents and continental subregions by population, fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in List of sovereign states and dependent territories in North America, 23 independent states, or about 7.5% of the world's population. In Americas (terminology)#Human ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Courier 547
A courier is a person or organisation that delivers a message, package or letter from one place or person to another place or person. Typically, a courier provides their courier service on a commercial contract basis; however, some couriers are government or state agency employees (for example: a diplomatic courier). Duties and functions Couriers are distinguished from ordinary mail services by features such as speed, security, tracking, signature, specialization and individualization of express services, and swift delivery times, which are optional for most everyday mail services. As a premium service, couriers are usually more expensive than standard mail services, and their use is normally limited to packages where one or more of these features are considered important enough to warrant the cost. Courier services operate on all scales, from within specific towns or cities, to regional, national and global services. Large courier companies include DHL, DTDC, FedEx, EMS Intern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kinetic Friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into ''static friction'' ("stiction") between non-moving surfaces, and ''kinetic friction'' between moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features, known as asperities (see Figure 1). *Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. *Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces. *Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body. *Internal friction is the force resisting motion between the elements making up a sol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Track Stand
The track stand or standstill is a technique that bicycle riders can use to maintain balance while their bicycle remains stationary or moves only minimal distances. The technique originated in track cycling and is now used by other types of cyclists wishing to stop for a short time without putting a foot on the ground, such as bike commuters at stop signs. To perform a track stand, a cyclist holds the cranks in an approximately horizontal position with the front wheel steered to the left or right, and pedals forward, and back in the case of a fixed-gear bicycle, which the steered front wheel converts into a side-to-side motion. Origin and use The term originated from use of the technique by track cyclists prior to starting, or as a tactic in track sprinting whereby riders will initially ride very slowly and maneuver across the track in an effort to get their rival to take the lead so that they can then draft (or slipstream) behind, conserving energy for the final sprint. Ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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