Each skateboard wheel is mounted on its axle via two bearings. With few exceptions, the bearings are the industrial standard 608 size, with a bore of 8 mm (or 10mm depending on the axle), an outer diameter of 22 mm, and a width of 7 mm.

Skateboarding started in California in the 1950s. The first skateboards were made from roller skates (attached to a board). Skateboarding gained in popularity because of surfing; in fact, skateboarding was initially referred to as sidewalk surfing.

Skateboarding is a very individual activity. There is no right or wrong way to skate. Skateboarding still hasn’t stopped evolving, and skaters are coming up with new tricks all the time. Skateboarding has gone through its ups and downs over the years. However, since 2000, due to attention in the media and products like skateboarding video games, children’s skateboards and commercialization, skateboarding has been pulled into the mainstream. As more interest and money has been invested into skateboarding, more skate parks, better skateboards have become available.

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Sports

Sports may be competitive, may require a degree of skill, especially at higher levels. Sports can be primarily physical (rugby or athletics), primarily mind (chess or go), primarily co-ordination (billiard sports), or primarily animal-supported (equestrian sport).
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