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Sheldon Brown (bicycle Mechanic)
Sheldon Brown (July 14, 1944 – February 4, 2008) was an American bicycle mechanic, technical expert and author. He contributed to print and online sources related to bicycling and bicycle mechanics, in particular the web site ''Sheldon Brown's Bicycle Technical Info''. His knowledge of bicycles was described as "encyclopaedic" by ''The Times'' of London. Background Brown was the parts manager, webmaster and technical consultant of Harris Cyclery, a bike shop in West Newton, Massachusetts, as well as an enthusiast of vintage and classic bicycles in addition to cycling in general. Brown maintained ''Sheldon Brown's Bicycle Technical Info'', a web site highlighting a broad range of cycling subjects ranging from how to fix a bicycle flat tire to details on Raleigh and English three-speed bicycles, Sturmey-Archer hubs, tandems, and fixed-gear bicycles. He repaired cameras and was an amateur photographer. His site features his photographic work. Brown maintained an English-French c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icebiking
Cold-weather biking, cold-weather cycling, or winter biking is the use of a bicycle during months when roads and paths are covered with ice, slush and snow. Cold weather cyclists face a number of challenges in near or below freezing temperatures. Urban commuters on city streets may have to deal with " ow, slush, salt, and sand", which can cause rust and damage to metal bike components. Slush and ice can jam derailleurs. Some cyclists may bike differently in winter, by "slow ngdown on turns and brak nggradually" in icy conditions. Gaining traction on snow and ice-covered roads can be difficult. Winter cyclists may use bikes with front and rear fenders, metal studded winter tires and flashing LED lights. Winter cyclists may wear layers of warm clothes and "ea face, and han coverings may be used. Specialized winter bikes called fatbikes, which have wide, oversized tires that are typically inflated with low pressure, are used in snow trail riding and winter bike competitions. Term ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Photographer
''Amateur Photographer'' is a British photography magazine, published weekly by Kelsey Media. The magazine provides articles on equipment reviews, photographic technique, and profiles of professional photographers. About the magazine ''Amateur Photographer'' was first published on 10 October 1884 by Hazell, Watson and Viney, making it over 130 years old. It has established itself as the world's number one weekly photography magazine. Some of the most renowned photographers such as Alfred Stieglitz, Frank Meadow Sutcliffe, David Bailey and Bob Carlos Clarke have written for the magazine over the years. This magazine is now owned by Kelsey Media which acquired it (with '' World Soccer'') from Future plc after Future acquired TI Media, the previous owner of the magazine. Regular features ''AP'' (as it is referred to) is usually based around the following items: *''AP'' News - information on the world of film and digital photography; including details of product launches, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recumbent Bicycle
A recumbent bicycle is a bicycle that places the rider in a laid-back reclining position. Most recumbent riders choose this type of design for ergonomic reasons: the rider's weight is distributed comfortably over a larger area, supported by back and buttocks. On a traditional upright bicycle, the body weight rests entirely on a small portion of the Tuberosity of the ischium, sitting bones, the feet, and the hands. Most recumbent models also have an aerodynamics, aerodynamic advantage; the reclined, legs-forward position of the rider's body presents a smaller frontal profile. A recumbent holds the world speed record for a bicycle, and they were banned from racing under the Union Cycliste Internationale (UCI) in 1934, and now race under the banner of the World Human Powered Vehicle Association (WHPVA) and International Human Powered Vehicle Association (IHPVA). Recumbents are available in a wide range of configurations, including: long to short wheelbase; large, small, or a mix ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upright Bicycle
Body relative directions (also known as egocentric coordinates) are orientation (geometry), geometrical orientations relative to a body such as a human person's. The most common ones are: left and right; forward(s) and backward(s); up and down. They form three pairs of orthogonal axes. Traditions and conventions Since definitions of left and right based on the geometry of the natural environment are unwieldy, in practice, the meaning of relative direction words is conveyed through tradition, acculturation, education, and direct reference. One common definition of up and down uses gravity and the Earth, planet Earth as a frame of reference. Since there is a very noticeable force of gravity acting between the Earth and any other nearby object, down is defined as that direction which an object moves in reference to the Earth when the object is allowed to free-fall, fall freely. Up is then defined as the opposite direction of down. Another common definition uses a human body, stand ... [...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 weath ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fixed-gear Bicycle
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 to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Usenet
Usenet () is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Ellis conceived the idea in 1979, and it was established in 1980.''From Usenet to CoWebs: interacting with social information spaces'', Christopher Lueg, Danyel Fisher, Springer (2003), , Users read and post messages (called ''articles'' or ''posts'', and collectively termed ''news'') to one or more topic categories, known as newsgroups. Usenet resembles a bulletin board system (BBS) in many respects and is the precursor to the Internet forums that have become widely used. Discussions are threaded, as with web forums and BBSs, though posts are stored on the server sequentially.The jargon file v4.4.7 , Jargon File Archive. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adventure Cycling
Adventure Cycling Association is a nonprofit member organization focused on travel by bicycle (bicycle touring). Headquartered in Missoula, Montana, Adventure Cycling develops cycling routes, publishes maps, provides guided trips, and advocates for better and safer cycling in the U.S. The organization grew from a mass cross-country bicycle ride in 1976 to celebrate the U.S. Bicentennial. Adventure Cycling also publishes a magazine, '' Adventure Cyclist''. Adventure Cycling celebrated its 40th anniversary in 2016 by hosting the Montana Bicycle Celebration in Missoula, promoting events like Bike Your Park Day and Bike Travel Weekend, and publishing its first-ever coffee table book, ''America's Bicycle Route: The Story of the TransAmerica Bicycle Trail''. Origins Adventure Cycling Association was founded in 1973 as Bikecentennial by Dan and Lys Burden and Greg and June Siple during the couples' Hemistour bicycle ride from Anchorage, Alaska, to Tierra del Fuego, Argentina. They pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jobst Brandt
Jobst Brandt (January 14, 1935 – May 5, 2015) was an American mechanical engineer, inventor, bicycle enthusiast, educator, and author. Early life Brandt was born in New York City, where his father, the German-born agricultural economist Karl Brandt, was a professor at the New School for Social Research. The family moved to Palo Alto in 1938. Jobst Brandt studied mechanical engineering at Stanford University, graduating in 1958. After two years of military service in the US Army Corps of Engineers, stationed near Frankfurt, Germany, he found employment at Porsche. His subsequent employers included Hewlett Packard, SLAC National Accelerator Laboratory, and Avocet, a bicycle accessories brand. At Avocet, he was involved in the development of a cyclocomputer (patent 6,134,508), touring shoes (patent 4,547,983), and a high-performance bicycle tire, and published ''The Bicycle Wheel'', a unique treatise on wheelbuilding which became a best-seller. Legacy From the late 1980s until the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mirror Website
Mirror sites or mirrors are replicas of other websites or any network node. The concept of mirroring applies to network services accessible through any protocol, such as HTTP or FTP. Such sites have different URLs than the original site, but host identical or near-identical content. Mirror sites are often located in a different geographic region than the original, or upstream site. The purpose of mirrors is to reduce network traffic, improve access speed, ensure availability of the original site for technical or political reasons, or provide a real-time backup of the original site. Mirror sites are particularly important in developing countries, where internet access may be slower or less reliable. The maintainers of some mirrors choose not to replicate the entire contents of the upstream server they are mirroring because of technical constraints, or selecting only a subset relevant to their purpose, such as software written in a particular programming language, runnable on a sing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wheelbuilding
Wheelbuilding is the process of assembling wire wheels (generally a bicycle wheel, but including wheelchairs, and some cars). The components of a wire wheel are the rim, spokes, nipples, and hub. Goals The wheelwright must ensure that the wheel is true in two ways: lateral (sideways wobble) and radial Radial is a geometric term of location which may refer to: Mathematics and Direction * Vector (geometric), a line * Radius, adjective form of * Radial distance, a directional coordinate in a polar coordinate system * Radial set * A bearing f ... (roundness/hop). The wheel also needs to be properly dished if applicable (the left and right sides of the rear wheel differ, the drive-side spokes requiring higher tension). Spokes should have no residual twist (windup) from tightening the nipples. The spokes may be "stress relieved", i.e. subjected to a greater tension during building than they are ever likely to encounter in use - usually by squeezing pairs of spokes together ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bicycling Terminology
This is a glossary of terms and jargon used in cycling, mountain biking, and cycle sport. For ''parts of a bicycle'', see List of bicycle parts. 0–9 ; 27.5 Mountain bike: A mountain bike with wheels that are approximately in diameter and are based on ISO 584 mm (650B) rims. ; 29er (bicycle):A mountain bike with wheels that are approximately in diameter and are based on ISO 622 mm (700C) rims. ;3:1 rule : A UCI rule stating the depth and breadth (in cross-section) of the bicycle frame tubes cannot exceed the ratio of 3:1. A ; À bloc: Going ''À bloc'' means riding as hard as one possibly can, which can be risky as it leaves one in a state where recovery is needed, and therefore vulnerable to being attacked. ; Aero bars: Extension of the handlebars usually allowing the rider to rest their elbows and benefit from improved aerodynamics. Often found on Time trial bicycles. ; Aero racing bicycle: A type of racing bike that combines the aerodynamic features of a ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
