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Bearings consist of 6, 7, or 8 balls enclosed in races between two shields encased in a disc-like body. Bearings can be measured by an ABEC rating. Skateboard bearings typically come in sets of eight and are inserted into both sides of the wheel; two bearings for each of the four wheels.
Many skateboard bearings are graded according to the ABEC scale. The starts with ABEC 1 with the least precise manufacturing tolerance, followed by 3, 5, 7, and ABEC 9 with the strictest tolerance. Bearing performance is determined by how well maintained the bearings are. Maintenance on bearings includes periodically cleaning and lubricating them.
The move likely originated in backyard pools in the mid 1970s, as the early skaters gained in skill and confidence with their high speed carves around the top of the pool walls and one day unintentionally skated up to the edge of the pool, causing the trucks or board of the skateboard to slide (or grind) along the surface .
Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.
Although bearings had been developed since ancient times, the first modern recorded patent on ball bearings was awarded to Philip Vaughan, a Welsh inventor and ironmaster who created the first design for a ball bearing in Carmarthen in 1794. His was the first modern ball-bearing design, with the ball running along a groove in the axle assembly.
Hydrodynamic bearings rely on the high speed of the journal (the part of the shaft resting on the fluid) to pressurize the fluid in a wedge between the faces. Fluid bearings are frequently used in high load, high speed or high precision applications where ordinary ball bearings would have shortened life or caused high noise and vibration. They ...
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James Chris Cole (born March 10, 1982) is an American professional skateboarder.As of September 2020, his sponsors are Fallen Footwear, Monster Energy, Bones Bearings, Cult Crew, Thunder Trucks, Spitfire Wheels, Stance, Kershaw Knives, Grizzly Griptape, GoPro, Indian Motorcycles, cbdMD, Remind Insoles, and most recently Zero Skateboards.
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