Enduro Bearings are an industry-leading design and set the standard for all other bearing manufacturers. Enduro has tailored their bearings for the specific demands of cycling. The entry-level industry standard for a bearing is ABEC 1, but Enduro does not produce any bearing that comes in below ABEC 3, meaning that even the entry-level Enduro bearing is of better quality than another manufacturer's entry-level bearing. These standard ABEC 3/5 bearings are designed for use within bottom brackets or hubs and provide outstanding performance and longevity to your components.