Bearings Inline_skates

axles, bearings , spacers

ball bearings allow wheels rotate freely , smoothly. bearings rated on abec scale, measure of manufactured precision tolerance, ranging 1 (worst) 9 (best) in odd numbers. abec standards intended high-speed machinery, not skating applications, , not account quality of steel used, important how long bearings last. while higher rated bearings better in overall quality, whether automatically translate more speed questionable. since @ least 2007, rollerblade brand amongst others have begun using own rating system. instance, rollerblade brand using sg1 sg9 rating system, whereas twincam brand using own ilq (inline qualified) rating system , bones brand using own skate rated rating system.

a mistake made in purchasing bearings spending more translates more speed. generally, clean inline skate bearings contribute 2% of rolling resistance best urethane inline skate wheels produce, there little opportunity in improving speed spending more money on bearings. newer bearings on market have been offered use ceramic ball bearings instead of steel, more expensive traditional steel bearings made of harder material.

two bearings used per wheel. bearings slip openings molded each side of wheel hub, , flange molded wheel hub holds bearings correct distance apart. additionally there axle spacer either machined axle or slides on axle (depending on axle system used). since outer race of bearing contacts wheel spacer , inner race of bearing contacts axle spacer, critical relationship between these 2 spacers correct. if wheel spacer wider axle spacer bearings bind when axle bolt (or bolts) tightened.