Ceramic Hybrid Bearing (Road), 6806 30x42x7 by Kogel Bearings

Kogel ceramic bearing balls are smoother and rounder than any steel bearing due to their material properties. Silicon Nitride can be polished much smoother than steel. Also, it does not compress as much as steel, leaving the contact points with the bearing races very small and not deformed like a tennis ball under load. Compressing any material under load and trying to roll it will cause unnecessary drag. When we talk about wheel bearings—2 bearings in the front, 2 in the rear, and 2 in the freehub—it is worth considering what you want from your seals. The Kogel Bearings road seals are designed to create the lowest friction possible in a sealed bearing. The cross seals are designed to provide the best protection against environmental elements. Specifications Size: 30 x 42 x 7mm Condition: perfect, no issues