Most bike companies sell "bicycle" or "sporting" grade bearings. NOT BBINFINITE! We only manufacture and sell the finest industrial-grade bearings. Our ABEC-7 bearings are the same ones used in electric motors and machinery, systems that are expected to spin at 5,000-10,000 rpms for hours on end. Our ABEC-7 bearings outperform the vast majority of ceramic bearings available to consumers today. If you want better performance than these ABEC-7 industrial-grade bearings, you're just going to have to buy Ceramitechs.