Enduro Standard Abec 3 are great replacement bearings for hubs pedals and bottom brackets. Grade 10 Chromium Steel Balls. In spec to 10/1.000.000\u2033 52100 High Carbon Chromium Alloy Races. What's the difference between ABEC 3 and ABEC 5? ABEC is an acronym for a committee that sets standards for bearings. Higher numbers mean higher tolerances (and price). For example ABEC 3 balls are in tolerance to 10/1.000.000' vs. 5/1.000.000' found in the ABEC 5. How does this affect me? Higher tolerance bearings are smoother and faster. With precision the balls will support the bearing better and increase life expectancy. To find the correct bearing please check your owner's manual. These are premium bearings that are among the longest lasting available however bearing life is dependent on factors such as weather maintenance and installation. Please use correct installation methods and follow your component's torque specifications. Failure to do so will result in premature bearing wear. * We're Australia's #1 retailer of MTB parts, clothing and accessories! Orders ship next business day. Note orders may incur NZ customs duty or tax - see whatsmyduty.org.nz.