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abec 7 Bearings

Abec 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 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 properly
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