CeramicSpeed 61901 Bearing

The 61901 bearing has an inner diameter of 12 mm, an outer diameter of 24 mm, and a height of 6 mm.

This bearing uses silicon nitride ceramic balls, which are harder, lighter, and smoother than steel. This results in significantly lower friction and a longer lifespan, as the ceramic material is less prone to wear and deformation under load.

While this specific model is optimized for road cycling, the non-contact seals and reinforced polyamide cage provide good protection against debris. However, for extreme mud or grit conditions, you may want to consider a bearing with more robust sealing options.

Yes, you should use a proper bearing press tool to ensure even pressure during installation. Avoid using a hammer or punch, as this can damage the races and compromise the precision of the ceramic balls.

The non-contact seal is designed to minimize drag while keeping contaminants out. It is highly effective for standard road riding conditions, though it is not intended for submersion or high-pressure washing.

This product is sold as a single unit per pack. Please ensure you check your hub or bottom bracket requirements to see if you need one or multiple bearings for your specific application.