Originally posted by jeffreylin
Nope, it's the opposite. The higher the ABEC rating corresponds to higher quality bearings with tighter manufacturing tolerances.
Here's a fact taken right off the Acer Website. Might want to read the entire thing!
"Lightweight ceramic balls dramatically decrease the centrifugal force placed by the balls on the rings. This, in addition to a 50% higher modulus of elasticity than conventional bearings, and Grade 5 smoothness of the balls (contrary to popular belief the lower the Grade number a ball is, the rounder and smoother it is), produce a lower coefficient of friction at the ball-raceway interface, leading to over 33% less friction in the bearing as compared to conventional bearings, and far less wear, lasting an average of ten times longer than conventional bearings. Sealed with our exclusive no contact seals for the lowest friction and best dirt resistance. These are the best and most high tech seals available."
This was a topic already discussed in another Cerimac Bearing thread. Even the gentleman that ownes RC4Less joined the discussion and said the above quote was correct. Now when talking about diff balls and diff balls only, the higher the number the better. Kinda funny, Acer offers a higher quality ball bearing while RC4Less offers a higher quality diff ball (when speaking of ceramics of course).