KINETIC BIKE BEARINGS Grade 10 6002-LLB (Enduro)DetailsDetailsInner Diameter x Outer Diameter x Depth: 25 x 37 x 7mmUsed on: Wheels & Bottom BracketsPrecision Tolerance: ABEC3Ball Roundness : Grade 10Seals: LLBGrease: Low friction temperature stable greaseMaterial: 52100 High Carbon Chromium Alloy RacesNote This listing is for single bearings .Why Choose Enduro Bearings?Unlike others Enduro bearings are not just �off the shelf� Industrial bearings. They are tailored specifically for the demands of cycling. Every aspect of an Enduro bearing is considered and spec�d to provide superior performance and value for each application. From the material of the races and the ball bearings the types of seal and even the grease. Each of these has a profound effect of the performance and longevity of a bearing.What is ABEC?The ABEC grade of bearings is a set of standards for the manufacturing tolerances of bearings. There are five classes from largest to smallest tolerances: 1 3 5 7 and 9. The higher ABEC classes provide better precision efficiency and greater speed capabilities but do not necessarily make the components spin faster. All quality manufacturers around the world manufacture to at least ABEC 1 standard. Enduro�s Minimum Standard is ABEC 3. What is the meaning of Ball Grade?Bearing balls are manufactured to a specific grade which defines its geometric tolerances (or roundness). The smaller the number the higher the precision. A grade 20 ball for instance is 20/1 000 000' out of round. Enduro use Grade 10 for ABEC 3.