CeramicSpeed Bearing

The CeramicSpeed 6903 bearing has an inner diameter of 17mm, an outer diameter of 30mm, and a width of 7mm.

These bearings use Grade 3 Silicone Nitride ceramic balls, which are significantly harder, lighter, and smoother than standard steel. This reduces friction and improves power transfer, while the hardened steel raceways and reinforced polyamide cage ensure long-term durability.

Yes, they are optimized for all cycling disciplines. The non-contact seals are specifically designed to block dirt and moisture, making them reliable even in challenging conditions.

These bearings come pre-lubricated with CeramicSpeed All Round grease, which is designed to minimize friction and protect the internal components. Because they use non-contact seals, they require less maintenance than standard bearings, though you should still inspect them periodically for contamination.

Every CeramicSpeed 6903 bearing is hand-built in Denmark to ensure precise quality control and consistent performance.