Are you aware that over 70% of all bearings sold on eBay or Amazon are counterfeit or grade B bearings? It's a global problem (just jump on Google to research). This is why I source bearings for Mavic wheels directly from Mavic because they verify that the bearings that they offer are legitimate. Besides the above, Mavic has always used very high quality bearings. Why would you cut corners on such a critical part of your wheels?