LOLLLLLL. ABEC ratings jump from 9 to 12 because of the sizing, ABEC 11 on 608 bearings is retarded =]. "Equivilent" is what it says not actually ABEC 11. ABEC rating was used to judge the quality of aircraft bearings. I've run ABEC 9s and the speed difference is nice but it honestly says nothing of the quality of materials etc. I've seen ABEC 12s in action and they're not pretty, because they're ghetto and generally don't last long. Get Bones Swiss if you want the fastest around but don't take heed of ABEC rating for nothing. Don't buy less than stock ABEC 5/7s though, spending money on your bearings is worth it =]. But don't buy something that says it's ABEC 11 Equiv. Because it's just not logical.