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2. Skateboard - Wikipedia

   en.wikipedia.org/wiki/Skateboard

   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).

3. Ball bearing - Wikipedia

   en.wikipedia.org/wiki/Ball_bearing

   In some settings only a thin coating of ceramic is used over a metal ball bearing. Fully ceramic bearings These bearings make use of both ceramic balls and race. These bearings are impervious to corrosion and rarely require lubrication if at all. Due to the stiffness and hardness of the balls and race these bearings are noisy at high speeds.

4. List of skateboarding brands - Wikipedia

   en.wikipedia.org/wiki/List_of_skateboarding_brands

   There are many skateboarding brands from around the world, covering boards, wheels, skate shoes, and accessories including skateboarding-brand watches and wallets. Most brands sell parts separately. A complete skateboard can be made of any brands of the products listed below.

5. Silicon nitride - Wikipedia

   en.wikipedia.org/wiki/Silicon_nitride

   Si 3 N 4 bearing parts. Silicon nitride bearings are both full ceramic bearings and ceramic hybrid bearings with balls in ceramics and races in steel. Silicon nitride ceramics have good shock resistance compared to other ceramics. Therefore, ball bearings made of silicon nitride ceramic are used in performance bearings.

6. Powell Peralta - Wikipedia

   en.wikipedia.org/wiki/Powell_Peralta

   The company rose to prominence in the 1980s as skateboarding began maturing as a sport. The company featured the Bones Brigade, a team featuring the era's top competitors. Peralta left the company in 1991 and Powell continued to produce skateboard equipment as Powell, Bones Bearings and RollerBones.

7. List of skateboarding terms - Wikipedia

   en.wikipedia.org/wiki/List_of_skateboarding_terms

   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.