Ignoramus2057 writes:

Are those skateboard bearings really made to ABEC 7?

You can't trust the skate and skateboard manufacturers. From the beginning
they were designing in those bearings way beyond their specific load
limits, putting many 100s of lbs onto 608 bearings. They're children (when
it comes to engineering) marketing to children. Not that they haven't been
very successful commercially in many cases.

Take that premise and run it through eBay, and you've got utter nonsense.