Bicycle replacement steel ball bearings — durable carbon steel balls for bearing retainers Key benefits Easy and convenient to use: designed to be dropped into bearing holders or retainers for quick replacement of worn ball bearings. Restores smooth movement: replaces mobile bicycle parts that rely on ball bearings, reducing play and friction. Built for strength and longevity: made from carbon steel for high intensity, strong performance and long service life. Features and specifications Material: carbon steel ball bearings — strong, wear-resistant, and durable. Function: individual steel balls intended to fit into standard bearing holder designs as replacement components for moving parts on bicycles. Compatibility: suitable for ordinary bicycles, mountain bikes, and stretch bicycles (fits bearing retainer applications on these bike types). Why customers need this product Prevents further damage: replacing worn bearing balls protects hubs, pivots and other bearing assemblies from accelerated wear. Cost-effective repair: replacing only the balls is a practical way to restore bearing performance without replacing entire assemblies. Reliable performance: carbon steel construction provides the strength and durability required for everyday cycling and off-road use. Practical use scenarios Replace worn or lost ball bearings in a wheel hub to restore smooth rotation and reduce wobble. Service a mountain bike bearing assembly after riding in wet or muddy conditions to regain precise movement. Renew bearings in folding or stretch bicycles where compact bearing retainers use individual steel balls. Installation note Verify that the ball size and count match your bearing retainer before installation and follow standard bike maintenance practices when disassembling and reassembling bearing assemblies. Suitable for users who need a straightforward, durable replacement set of steel ball bearings to maintain or repair bicycle bearing assemblies.