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Two inline skate wheels with different durometer – 85A and 83A Digital Shore hardness tester. The Shore durometer is a device for measuring the hardness of a material, typically of polymers. [1] Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials. Lower numbers indicate less resistance and softer ...
These wheels wore out far too quickly, in as little as seven or eight hours. [1] Nasworthy moved to Southern California in 1971 to surf and noticed that kids were trying to skateboard when the surf was down. He thought the soft polyurethane wheels would be ideal for skateboards, and had his father send him 10 sets.
Each skateboard wheel is mounted on its axle via two ball bearings. With few exceptions, the bearings are the industrial standard "608" size, with a bore of 8 or 10 mm (0.315 or 0.394 inches) depending on the axle, an outer diameter of 22 mm (0.866 inches), and a width of 7 mm (0.276 inches).
Like wheels, bushings are available with different levels of hardness. The kingpin nut may be tightened or loosened to adjust the turning radius and response of the truck itself. Tighter bushings mean stiffer trucks and less chance of "wheel bite", where the wheel makes contact with the deck, damaging the deck and slowing or stopping the wheels.
Kryptonics Skateboards is an American manufacturer of Skateboards and Longboards founded in 1965 and originally manufactured polyurethane products for the mining and computer industry. In the mid-1970s, the company introduced the Kryptonics Star Trac line of wheels that drastically changed the functionality of skateboards.
Typical longboard wheels range from 65 to 107 millimeters (2.6 to 4.2 in) in diameter. A taller wheel will have slower acceleration but a faster rolling speed. Smaller wheels have the opposite effect. The durometer of a wheel is how hard the urethane is. A softer wheel will be ultimately slower than a harder wheel on smooth surface.