SKF bearings are known as one of the most famous bearing Brands in the world. They have been used by the bestWicked Koyo bearings are proudly using Japanese technology and materials – like the best quality steel available. The inner and the outer ring as well as the balls are made out of chrome steel and for the cage the engeneers used glass-fiber reinforced polyamid. The smooth running oil used for the lubrication is the lowest viscosity Japanese made oil in order to reduce friction. They are ultra-fast spinning an extra durable if maintained well. The bearings from the land of the samurai fear no comparison. BE WICKED.

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https://www.thisissoul.com/blogs/buyers-guide/everything-about-bearings