Ceramicspeed bearings 61902-2rsf / hc5

Evolve your wheels with Ceramispeed bearings and go faster with less effort. Ceramicspeed balls are rounder, harder, softer, stiffer, and lighter than other brands of steel and ceramic balls. They save energy thanks to their extremely low friction, and this lower rolling resistance contributes to the increased transfer of power when pedaling. That is why many professional teams and athletes choose them.