There are many different choices of bearings for a longboard. The bearings sit inside of the wheel, and spin on the truck axles. Most bearings are made of steel, although those of the highest quality are made of ceramic. Steel ball bearings are mainstream bearings that are in widespread use, and readily available in skateshops and online distributors. Steel ball bearings are meant for the average skateboarder. Ceramic bearings are meant for the riders who have more stringent demands. They cost much more than steel ball bearings, but have less friction. The advantages for ceramic ball bearings include a smoother roll (if kept clean), longer life, rust resistance and a lighter weight as compared to steel. Their thermal resistance makes them ideal for high speed downhill runs. Two of the main materials used in manufacturing of the ceramic balls is ceramic Cerbec silicon nitride, and ceramic Zirconium Oxide.
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