Z-FIRST Precision 608 RS ABEC 9 Bearings for  ABEC 9 skateboard bearings, suitable for scooter,skate and longboards,double-row. Inner Diameter: 8mm, Outer Diameter: 22mm,Thickness: 7mm; Material: Abec 9 Skateboard Bearings | Lily BearingAbec-9 has been the highest grade in bearing industry. The Abec 9 rollerblade bearing can be applied to any harsh conditions with high speed requirements
Abec vs. Skate Rated™ - Support - Bones BearingsThe ABEC rating system includes grades 1,3,5,7, and 9. The higher the ABEC rating, the tighter the tolerances are, making the bearing a more precision partBullseye Bearings ABEC 9 Skateboard  The Bullseye ABEC 9 bearing is best for very fast speeds and high precision. For example, if you wanted to achieve high speeds in a downhill style skate, these ABEC scale - WikipediaThere are five classes from largest to smallest tolerances: 1, 3, 5, 7, 9. The higher ABEC classes provide better precision, efficiency, and the possibility of greater The ABEC Myth | Transworld SKATEboardingJul 13, 2002 - The ABEC rating system uses odd numbers, ranging from 1 to 9. The higher the number, the tighter the tolerance of the bearing, and thus