Skateboard

A skateboard is a specialized piece of sports equipment used for the activity of skateboarding.

It allows a person to move across various surfaces using gravity, leg pumping, or foot pushing. To move, a rider keeps one foot balanced on the deck while pushing the ground with the other. In structures like a half pipe or a bowl, riders use a pumping motion with their legs to maintain momentum. Riders also have specific stances based on their leading foot. If the left foot is in front, the rider is in a "regular" stance. If the right foot is in front, the stance is called "goofy."\n\nThe construction of a skateboard relies on several precise mechanical components working together. The foundation is the deck, which is usually made of seven to eight layers of maple plywood. Attached to the underside of the deck are two metal parts called trucks. These trucks consist of a hanger, which holds the axle and wheels, and a baseplate that mounts to the board. A central bolt called a kingpin joins the hanger and baseplate. This design allows the truck to swivel, which enables the rider to turn.

To manage how easily a board turns, a rider can adjust the tightness of the kingpin.\n\nMovement is made possible by the wheels and the bearings inside them. Most skateboards use four wheels made of a material called polyurethane (PU). These wheels typically range in size from 48mm to 60mm. Smaller, lighter wheels are ideal for performing tricks or traveling short distances. Larger, heavier wheels are better for maintaining speed over long distances.

Each wheel is mounted on an axle using two ball bearings. These bearings are usually the industrial "608" size. Most are made of steel, but some use a high-tech ceramic called silicon nitride. The precision of these bearings is often measured by the ABEC scale. This scale ranges from ABEC 1, which has the least precise manufacturing, to ABEC 9, which has the strictest tolerances.\n\nSkateboards come in several distinct types designed for different purposes. The longboard is a common variant used for high speeds and riding on rough surfaces. In contrast, shortboards are often used for technical tricks. There are also small plastic boards known as "penny" boards, while larger versions are called "nickel" boards. Many modern skaters use "popsicle" decks, which are the standard shape for tricks. These decks often feature a concavity, which is a curved shape that helps with control.

Some older styles, like those from the 1970s or 1980s, may be wider and have only one kicktail. Some of these "old school" boards may even have little to no concavity.\n\nThe history of skateboarding is closely tied to surf culture. It likely began in the late 1940s or early 1950s in California. Surfers wanted a way to practice when the ocean waves were flat, so they called it "sidewalk surfing." The earliest versions were very simple, often made by attaching roller skate wheels to wooden planks or even wooden boxes. As the activity gained popularity, companies began manufacturing skateboards in 1959. Since 1987, the sport has moved into the mainstream. This shift was driven by films, media, and even skateboarding video games. This commercialization has led to more investment in better equipment and the construction of dedicated skate parks.\n\nSpecific dimensions and measurements define the modern skateboarding experience. A standard popsicle deck is often sold with a width between 7.5 and 9 inches. A very common size is 8.25 inches wide by 32.475 inches long. The wheelbase, which is the distance between the trucks, is typically 14.25 inches. The nose of the board is often 7.25 inches longer than the tail, which is 6.875 inches. These precise measurements help ensure the board is stable and responsive. Even small additions, like deck rails, serve specific roles. These thin plastic strips are screwed into the bottom to protect the board's graphics and reduce friction during slide tricks.\n\nSkateboarding continues to evolve as a global sport and a field of constant innovation. The interest from the public has motivated companies to keep inventing new parts and designs. This evolution reached a major milestone when skateboarding appeared in the 2020 Summer Olympics. The sport is highly individual, allowing riders to express themselves through different styles and tricks. It connects to many other areas of culture, from fashion to digital media. As technology improves, the materials used in boards and bearings continue to advance, keeping the sport moving forward.