Black bearing B5 bearings are hybrid bearings, more commonly referred to as "ceramics". The ceramic black bearing B5 hybrid bearings are composed of the following elements: inner and outer rings in treated stainless steel for better mechanical strength. Compared to a standard steel bearing, the advantages of the B5 ceramic hybrid bearings are numerous Gain weight (ceramic density < steel), hold at very high speeds, much longer life (several times that of a standard), less friction
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