A skateboard is typically a specially designed plywood board combined with a quad wheeled, dual "truck" eight bearing system designed for both movement and stunts, used primarily for the activity of skateboarding Skateboarding is the act of riding and performing tricks using a skateboard. A person who skateboards is most often referred to as a skateboarder, or colloquially within the skateboarding community, a skater. The modern skateboard originated in California in the late 1970s. In time, it became a half time for surfers when the waves were lax. By the mid 1980s they were mass produced and sold throughout the United States.

A skateboard is propelled by pushing with one foot while the other remains on the board, or by pumping Pumping is a longboarding technique used to gain speed without the riders' feet leaving the board. This is done by selectively applying pressure to different parts of the board. Pumping can be done on flatland by turning or on a transition like a ramp or quarter pipe one's legs in structures such as a pool or half pipe A half-pipe is a structure used in gravity extreme sports such as snowboarding, skateboarding, skiing, freestyle BMX and inline skating. The structure is usually wood, although sometimes the surface is made of another material such as concrete, metal, dirt or snow. In appearance, it resembles a cross section of a swimming-pool, and in its most. A skateboard can also be used by simply standing on the deck while on a downward slope and allowing gravity to propel the board and rider. if you ride with your right foot forward, you ride "goofy". if you ride with your left foot forward, you ride regular.

There is no governing body that declares any regulations on what constitutes a skateboard or the parts from which it is assembled. Historically, the skateboard has conformed both to contemporary trends and to the ever evolving array of stunts performed by riders/users, who require a certain functionality from the board. Of course, the board shape depends largely upon its desired function. Longboards A longboard is a skateboard with a longer and sometimes wider shape used for longboarding. They are most commonly used for cruising, downhill racing, slalom racing, or transportation. Longboards can be shaped in various different ways, depending on the type of riding intended. Their greater weight and bulk makes them less suitable for many are a type of skateboard with a longer wheelbase and larger, softer wheels.

History

There is no definitive origin or inventor An invention is a new composition, device, or process. An invention may be derived from a pre-existing model or idea, or it could be independently conceived in which case it may be a radical breakthrough. In addition, there is cultural invention, which is an innovative set of useful social behaviors adopted by people and passed on to others of the skateboard. One proposed origin is that skateboards arose in the 1930s and 1940s, when children would participate in soapbox A soapbox car is a motorless vehicle capable of holding a driver (usually a child) built for the purpose of racing or recreation. Propelled by gravity, soapbox cars can reach upwards of 50 km/h (30 miles per hour). Originally, soapbox cars were built from wooden soap (or orange) crates and rollerskate wheels, but have grown more sophisticated over races, using soap-boxes attached to wooden planks on rollerskate Roller skating is the traveling on smooth surfaces with roller skates. It is a form of recreation as well as a sport, and can also be a form of transportation. Skates generally come in two basic varieties: quad roller skates and inline skates or blades, though some have experimented with a single-wheeled "quintessence skate" or other wheels. When the soap-box became detached from the plank, children would ride these primitive "skateboards". However, there are arguments that this origin is not accurate, and that it has simply been taken from the film Back to the Future Back to the Future is a 1985 American science fiction adventure comedy film directed by Robert Zemeckis, written by Zemeckis and Bob Gale, produced by Steven Spielberg, and starring Michael J. Fox, Christopher Lloyd, Lea Thompson, and Crispin Glover. The film tells the story of Marty McFly, a teenager who is accidentally sent back in time from 1985. Another suggests that the skateboard was created directly from the adaptation of a single roller skate taken apart and nailed to a 2x4, without the soapbox at all. Surfers would skate when the waves were flat and began skating to recreate surfing on land, some surfers began to do tricks on the land such as Bert slides and Power slides. Another theory about the origin of skateboards claims that third and fourth grade children in the Los Angeles Los Angeles is the second largest city in the United States, the largest city in the state of California and the western United States, with a population of 3.83 million within its administrative limits on a land area of 498.3 square miles (1,290.6 km2). The urban area of Los Angeles extends beyond the administrative city limits with a population South Bay Area developed skateboards in the spring of 1952 or 1953, after having received roller skates as the "Christmas gift of choice." The young children who developed skate boards in 1952 and/or 1953 did not do this quite so much as an outright imitation of surfing, but rather, simply because the skates they had received for Christmas eventually fell apart under hard use, and they found that they could continue and enhance the skating experience by nailing skate halves to 3-to-4 foot long boards, and then by learning to balance themselves on the boards while rolling down hills.

In 1972, the first Urethane wheels came into production which made these tricks possible. Some of the most well known early skaters, the "Z-boys The Z-Boys were a group of skateboarders in the 1970's from South Santa Monica and Venice California who are credited with inventing modern skateboarding and essentially creating the punk/skater subculture that now exists. Their name is derived from the name of the team they competed with together, the Zephyr Competition Team" named after the Zephyr surf shop, used a more fluid motion than most skaters at the time and styled themselves after a famous surfer.^{[citation needed]} The skaters brought back the trend from its slump in 1975 during the Del Mar competition where they wowed audiences with their close to ground maneuvers and fluid movements. The main types of skating during this time were slalom, long jump, free style, and downhill racing.^{[citation needed]} Later during the drought of California the Z-boys and other skaters started to skate empty pools thus creating vert skating. One of the group's members, Tony Alva, would perform the world's first Aerial in a swimming pool.^{[citation needed]}

Retail skateboards were first marketed in 1958 by Bill and Mark Richard of Dana Point, California. They attached roller skate wheels from the Chicago Roller Skate Company to a plank of wood and sold them in their Val Surf Shops.^[1] As skateboarding became more popular, Larry Stevenson created the "kick tail" on a skateboard which led to the design of the trick board.^{[citation needed]} The sport of skating was considered to be an outcast sport because of its strong ties to the punk and hardcore scene during the 80s.^{[citation needed]} It wasn't until the 2000s X Games that skateboarding made a new name for itself as an official sport.

Parts

Descriptions of the following skateboard parts are the ones most prevalent in popular, modern forms of skateboarding. Many niche disciplines exist with exotic or alternative constructions and designs that fall outside of much of the descriptions listed. The usual parts to design a complete skateboard are the deck, trucks, wheels, bearings, hardware, and griptape.

Deck

Most decks are constructed with a six to seven-ply Plywood is a manufactured wood, made by gluing together a number of thin veneers or plies of softwood or hardwood. It is used mostly in commercial sites, purely because it is a strong durable substance. A common reason for using plywood instead of plain wood is its resistance to cracking, shrinkage, twisting/warping, and its general high degree of cross-laminated layup of Canadian maple Acer is a genus of trees or shrubs commonly known as Maple. Other materials used in deck construction, such as fiberglass, bamboo, resin, Kevlar Kevlar is the registered trademark for a para-aramid synthetic fiber, related to other aramids such as Nomex and Technora. Developed at DuPont in 1965, this high strength material was first commercially used in the early 1970s as a replacement for steel in racing tires. Typically it is spun into ropes or fabric sheets that can be used as such or, carbon fiber, aluminum, and plastic, lighten the board or increase its strength or rigidity. Some decks made from maple ply are dyed to create various different coloured ply. Modern decks vary in size, but most are 7 to 10.5 inches wide. Wider decks can be used for greater stability when transition or ramp skating. Skateboard decks are usually between 28 and 33 inches long. The underside of the deck can be printed with a design by the manufacturer, blank, or decorated by any other means. On early year 2010 an European Company Gravitis introduced the proprietary asymmetric shape, with decentered twin tips to enhance the rider's stance.^{[citation needed]}

The longboard, a common variant of the skateboard, has a longer deck. This is mostly ridden down hills or by the beach. This was created by two surfers; Ben Whatson and Jonny Drapper. One of the first deck companies was called "Drapped" taken from Jonny's second name. "Old school" boards (those made in the 1970s–80s or modern boards that mimic their shape) are generally wider and often have only one kicktail. Variants of the 1970s often have little or no concavity, whereas 1980s models have deeper concavities and steeper kicktails.

Grip tape, when applied to the top surface of a skateboard, gives a skater's feet grip on the deck. It is most often black but can come in a variety of colors including clear, allowing the top of the deck to be decorated. It has an adhesive back and a sandpaper like top.

Trucks

Attached to the deck are two metal (usually aluminum alloy) trucks, which connect to the wheels and deck. The trucks are further composed of two parts. The top part of the truck is screwed to the deck and is called the baseplate, and beneath it is the hanger. The axle runs through the hanger. Between the baseplate and the hanger are bushings, also rubbers or grommets A grommet is a ring inserted into a hole through thin material, such as fabric. Grommets are generally flared or collared on each side to keep them in place, and are often made of metal, plastic, or rubber. They may be used to prevent tearing or abrasion of the pierced material, to cover sharp edges of the piercing, or both. A small grommet may, that provide the cushion mechanism for turning the skateboard. The bushings cushion the truck when it turns. The stiffer the bushings, the more resistant the skateboard is to turning. The softer the bushings, the easier it is to turn. A bolt called a kingpin The kingpin is the main pivot in the steering mechanism of a car or other vehicle. Originally this was literally a steel pin on which the moveable, steerable wheel was mounted to the suspension. Free to rotate on a single axis, it limited the degrees of freedom of motion of the rest of the front suspension. When its bearings were replaced starting holds these parts together and fits inside the bushings. Thus by tightening or loosening the kingpin nut, the trucks can be adjusted loosely for better turning and tighter for more stability.

Skateboard trucks are manufactured in a number of different axle widths. In general an axle width should be chosen that is close to the width of the deck it will be used with^[2]. For example, a 7.75" wide deck will usually be fitted with trucks that have axles between 7.5" wide and 8.0" wide. Trucks that are too wide can make doing tricks difficult and can cause the wheels to get in the way when the skateboard is being ridden. Trucks that are too small can be hard to maintain stability and can cause wheel bite to occur when turning.

Longboard specific trucks are a more recent development. A longboard truck has the king pin laid at a more acute angle (usually between 38 and 50 degrees^[3]) to the deck, this gives a lesser degree of turning for the same tilt of the deck. This allows riders to go much faster while still maintaining stability and control.

Wheels

The wheels of a skateboard, usually made of polyurethane A polyurethane is any polymer consisting of a chain of organic units joined by urethane (carbamate) links. Polyurethane polymers are formed through step-growth polymerization by reacting a monomer containing at least two isocyanate functional groups with another monomer containing at least two hydroxyl (alcohol) groups in the presence of a, come in many different sizes and shapes to suit different types of skating. Larger sizes like 54–85 mm roll faster, and also move more easily over cracks in pavement. Smaller sizes like 48–54 mm keep the board closer to the ground, require less force to accelerate and produce a lower center of gravity, but also make for a slower top speed. Wheels also are available in a variety of hardnesses usually measured on the Shore durometer "A" scale. Wheels range from the very soft (about Shore A 75) to the very hard (about Shore A 101). As the A scale stops at 100, any wheels labeled 101A or higher are harder, but do not use the appropriate durometer scale. Some wheel manufacturers now use the "B" or "D" scales, which have a larger and more accurate range of hardness.

Modern street skaters prefer smaller wheels (usually 51–54 mm), as small wheels with lighter trucks can make tricks A skateboarding trick, or simply a trick is a maneuver performed on a skateboard while skateboarding. Learning and perfecting new tricks is the major goal of many skateboarders, for whom most of the time spent skateboarding is spent on tricks like kickflips The kickflip is a skateboarding trick where the skateboarder drags his front foot at an angle up the nose of the skateboard in order to make it flip 360 degrees along the board's axis. Rodney Mullen invented the kickflip concept on August 13, 1983[citation needed]; however, he did not actually execute a kickflip until August 21, 1983 and other flip tricks easier by keeping the center of gravity of the skateboard closer to the deck, thus making the deck easier to spin. Street wheels are often quite hard as this allows the wheels to slide easier on waxed surfaces for bluntslides and nose/tailslides. Vertical ramp A vert ramp is a form of half-pipe used in "extreme sports" such as skateboarding or "vert" skating requires larger wheels (usually 55–65 mm), as it involves higher speeds. Vert wheels are also usually softer, allowing them to maintain high speed on ramps without sliding. Slalom skating requires even larger wheels (60–75 mm) to sustain the highest speeds possible. They also need to be soft and have better grip to make the tight and frequent turns in slalom racing. Even larger wheels are used in longboarding and downhill skateboarding. Sizes range from 65 mm to 100 mm. These extreme sizes of wheels almost always have cores of hard plastic that can be made thinner and lighter than a solid polyurethane wheel. They are often used by skateboard videographers as well, as the large soft wheels allow for smooth and easy movement over any terrain.

Bearings

Each skateboard wheel is mounted on its axle via two bearings A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle. With few exceptions, the bearings are the industrial standard "608" size, with a bore of 8 mm, an outer diameter of 22 mm, and a width of 7 mm. These are usually made of steel, though silicon nitride, a high-tech ceramic, is sometimes used. Many skateboard bearings are graded according to the ABEC scale The ABEC scale is a system used throughout the manufacturing industry for rating the manufacturing tolerances of precision bearings, developed by the Annular Bearing Engineering Committee of the American Bearing Manufacturers Association (ABMA). Bearings are rated using an odd number between 1 and 9. The higher the number, the greater the. The scale starts with ABEC1 as the lowest, 3, 5, 7, 9. It is a common misconception that the higher ABECs are better for skateboarding, as the ABEC rating only measures tolerances Dimensions, properties, or conditions may vary within certain practical limits without significantly affecting functioning of equipment or a process. Tolerances are specified to allow reasonable leeway for imperfections and inherent variability without compromising performance, which do not necessarily apply to skateboards. The ABEC rating does not determine how fast or how durable a bearing used for skateboarding will be.^[4] In particular, the ABEC rating says nothing about how well a bearing handles axial (side-to-side) loads, which are severe in most skateboard applications. Many companies do not show the ABEC rating, such as Bones Bearings, which makes bearings specifically for skateboarding, often marketed as "Skate Rated". These bearings are usually called Swiss Switzerland , officially the Swiss Confederation (Confœderatio Helvetica in Latin, hence its ISO country codes CH and CHE), is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe[note 4] where it is bordered by Germany to the north, France to the west, Italy to (made in Switzerland), ceramic or both and are better for skateboarding. Each bearing usually contains 7 steel or ceramic ball bearings, although other configurations are used as well.

Hardware

Mounting hardware is a set of eight 10-32 UNC bolts, usually an Allen A hex key, also known as an Allen, Inbus, zeta, or Unbrako key or wrench, is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head . The name zeta refers to zeta, the sixth letter of the Greek alphabet. The term hex-head is sometimes used to refer to this type of drive, but this use is not or Phillips head, and matching nylon locknuts. They are used to attach the trucks to the board. Some have a different colored bolt to show which side is the nose of the skateboard.

Optional components

Risers/wedges

Risers increase the space between the truck and the deck. This allows the truck to turn further without causing wheel bite (when the wheel touches the deck and stops rotating). Wedges can be used to change the turning characteristics of a truck.^[5]

Rails/ribs

Narrow strips of plastic or metal that are attached under the deck lengthwise along the edges. They are used for additional grip for grabs, and to enhance sliding while protecting the deck's graphics at the same time. Although rarely used anymore, they are useful for experienced skaters that are capable of grabs.

Grip tape

Grip tape is a sheet paper or fabric with adhesive on one side and a surface similar to fine sand paper on the other. Grip tape is applied to the top surface of a board to allow the rider's feet to grip the surface and help the skater stay on the board while doing tricks. Grip tape is usually black, however it is also available in other colors such as red, blue, navy blue, neon green, hi-liter pink, or transparent.

Slip tape

Slip tape is a clear piece of self adhesive plastic that sticks to the underside of a deck. It helps protect the board's graphics and allows the board to slide easier. Another name for this is everslick.

Lapper

A lapper is a plastic cover that is fastened to the rear truck and serves to protect the kingpin when grinding. It also prevents hang-ups by providing a smoother transition for the truck when it hits an obstacle or a metal pipe or round bar.

Nose guard

A plastic bumper used to protect the front of a skateboard. Used in old school boards.

Tail guard

Is a plastic cover that protects the tail end of the skateboard

Copers

Plastic half tubing that protected the axles of the trucks. In the 1980-85 period, stolen shopping cart handles were cut by some to fit as a makeshift coper.^{[citation needed]}

References

1. ^ Van Dulken, Stephen (2004). American Inventions: A History of Curious, Extraordinary, and Just Plain Useful Patents. NYU Press. pp. 55. ISBN The International Standard Book Number is a unique numeric commercial book identifier based upon the 9-digit Standard Book Numbering (SBN) code created by Gordon Foster, now Emeritus Professor of Statistics at Trinity College, Dublin, for the booksellers and stationers W.H. Smith and others in 1966 0814788130. http://books.google.com/books?id=ZbpU6LI89nIC&printsec=frontcover#PPA55,M1.
2. ^ Has a guide to choosing the right size trucks for a skateboard deck http://skate-parts.com/blog/choosing-right-size-trucks-your-skateboard-deck
3. ^ Contains a list of dimensions for popular longboard truck manufacturer http://www.randal.com/guides_faq.html
4. ^ http://lushlongboards.com/workshop/abec-ratings-explained-c-199_200.html
5. ^ A guide describing turning characteristics of different Riser/Wedge types http://www.randal.com/guides_faq.html

Categories: Skateboarding equipment

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