CeramicSpeed 61903 Standard Bearing - (6903). CeramicSpeed cartridge bearings are an upgrade option for any cycling discipline. These bearings provide extremely low friction improved power transfer and a service life that far exceeds traditional steel bearings.

Grade 3 Silicon Nitride balls

Hardened steel races

Reinforced polymide cage and non-contact seal to keep dirt and moisture out

High resistance to poor lubrication

Can be used for any cycling discipline

Sold as each

Hand built in Denmark