Our precision bicycle steel balls are crafted from high-hardness chrome steel with strict G10-G100 precision grinding, featuring perfectly spherical, burr-free mirror surfaces. High hardness reaches HRC 58-66, delivering outstanding wear resistance and evenly distributed load to cut bearing friction sharply. Compatible with bike hubs, headsets and bottom brackets, we supply full standard sizes from 1/8″ to 1/2″. Durable against daily riding abrasion, they extend bearing service life and maintain smooth wheel rotation. Strict size inspection guarantees consistent performance, ideal for bicycle factories, repair shops and cycling enthusiasts for reliable replacement and upgrade parts.