Presentation on theme: "By Bryce. Wheels TThe wheels of a skateboard, usually made of polyurethane, polyurethane come in many different sizes and shapes to suit different types."— Presentation transcript:
Wheels TThe wheels of a skateboard, usually made of polyurethane, polyurethane 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. Did you know that wheels use to be made out of metal.
Decks Most decks are constructed with a seven to seven-ply cross-laminated layup of Canadian maple. Other materials used in deck construction, such as fiberglass, bamboo, resin, Kevlar, 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 colored 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.plymapleKevlarGravitis
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, that provide the cushion mechanism for turning the skateboard.bushingsgrommets 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 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.kingpin
Hard ware Mounting hardware is a set of eight UNC bolts, usually an Allen 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. UNCAllenPhillipslocknuts
Bearings 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, 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 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, 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.  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 (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.bearings ABEC scaletolerances Bones BearingsSwissball bearings