Deep Groove Ball Bearings 6322, 6324, 6326, 6328, 6330, 6332, 6334, 6336, 6338, 6340, 6344, Open Type, Zz, 2RS, ABEC-1 Grade

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 properly

There are five classes, going from widest tolerances to tightest: 1, 3, 5, 7, and 9. Higher ABEC classes provide better precision, efficiency, and greater speed 

The answer is that "Bones Bearings are Skate Rated™ not ABEC rated." Bones® ... The ABEC rating system includes grades 1,3,5,7, and 9. The higher the 

Amazon.com : FREEDARE Bearings 608, ABEC 7 Bearings - Skateboard Bearings, Longboard Bearings, Skate Bearings（Blue, 1 Set of 8 : Sports & Outdoors

Jul 13, 2002 - Most of what the skateboarding public knows about the ABEC rating of .... between an ABEC 3 and an ABEC 7 bearing as subtle, and doesn't 

The 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