LUCKY ABEC-7 Bearings : Skateboard  I wish I had more closely inspected these bearings before skating with them. As you can see in the photo, one of the four bearings was not produced properlyWhat an ABEC Rating Tells You About Skateboard BearingsJul 22, 2018 - Skateboard bearings often have an ABEC rating that indicates the level  ABEC 7 bearings would be very fast and smooth, but very expensive
What Are ABEC Ratings? | AST BearingsIt was developed by the Annular Bearing Engineering Committee (ABEC) of  There are five classes, going from widest tolerances to tightest: 1, 3, 5, 7, and 9Abec vs. Skate Rated™ - Support - Bones BearingsIn an application like this, an ABEC - 7 or 9 bearing rating may be appropriate. However, a skateboard with 54mm wheels turning 20,000 RPM will be traveling ABEC scale - WikipediaThe ABEC scale is an industry accepted standard for the tolerances of a ball bearing.  Due to these factors, an ABEC 7 classified bearing could perform better than an ABEC 3 bearing. Bearings not conforming to at least ABEC 1 cannot be