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Inline Skate Wheels diagram 54 mm wheels – aggressive (flat profile) 68 mm wheels – inline hockey (round profile) 76 mm wheels – recreational / fitness; 100 mm wheels – race (elliptical profile) Legend
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).
An example of this is having 80 mm wheels in the 2nd and 3rd position and 76 mm in the front and back. A short frame (230–245 mm) is used to give the skate the maximum possible maneuverability. Inline skates used for slalom have a very tight fit with a strong cuff, to give sustained ankle support.
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.
In 1974, Powell's son came and asked for a skateboard. When Powell pulled an old one out of the garage, his son complained it did not ride smoothly. Powell became interested in skateboarding again, as he realized urethane wheels improved a skateboard's ride. With this prompting, Powell started making his own skateboards and wheels.
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A freeboard is a specialist skateboard designed to closely simulate the behavior of a snowboard. Freeboards were developed to allow snowboarders to transition to skateboarding (as non-winter transport) without the need to adapt to a smaller deck and narrower wheel -base.