Raindew hybrid ceramic bicycle bearings combine lightweight Si3N4 ceramic balls with bearing steel/stainless steel rings, precision-ground to ABEC-9 for low friction, high speed and long service life. The 2RS double rubber seals and pre-filled grease deliver excellent dust & mud resistance, while C0 clearance ensures smooth, quiet, maintenance-free rotation — an ideal upgrade for bicycle hubs, bottom brackets and pedals.
