CeramicSpeed Bearing 61902 6902 coated 15x28x7mm

61902 (6902) coated bearing - inner diameter 15mm/outer diameter 28mm/thickness 7mm Suitable for all disciplines. Advantages over standard bearings: Low friction, longer life and better power transfer. Ultra smooth silicon nitride balls combined with ultra smooth polished hardened steel grooves. Metallic layer 75% harder than hardened steel. Applied very thinly and evenly over the entire inner and outer surface Seals prevent the penetration of dirt and moisture CS balls 400% smoother, 128% harder and 58% lighter than standard steel bearings