ABEC 5: A standard value used to measure the tolerance of the surface of the rolling bearings. There are five classes: 1, 3, 5, 7 and 9. The higher the ABEC class, the greater the precision, efficiency and speed capacity, but the highest ABEC classes are not necessarily the fastest rotating parts. All quality manufacturers worldwide use at least ABEC 1 as standard. At Enduro, the minimum standard is ABEC 3. ABEC 5: Steel balls Grade 5: balls with a sphericity precision of 5/1,000,000. This is military level and therefore excellent for precision applications. ABEC 5 standard: this bearing must pass all tests; these are high-speed noise, very tight tolerances concerning accuracy of inner and outer diameter, perfect sphericity, track accuracy and the finish of both track and ball. These bearings are treated with a high-quality Teflon lubricant (Rheolube 374A). LLB: Our most popular seal, consisting of a rubber finish with a metal core. Unlike the standard 2RS, we go a little further by machining a notch in the inner ring, where the seal can rotate with excellent efficiency and resistance to a lesser bearing. Rather than a single "lip" of a thick seal rubbing against an uneven surface, the LLB type uses 2 sealing lips, as thin as a razor blade that slides into a notch with light contact. The outer "lip" keeps water and impurities out, while the inner seal retains the grease for smooth rotation and long intervals between maintenance.

Item number 71903LLB EAN 810191013341 Brands Enduro Bearing height (mm) 7 Inner diameter bearing (mm) 17 Outer diameter bearing (mm) 30 Type ABEC 5