Skate bearings size and skate bearing spacing is a general problem in itself.
Japanese or German, 28-30mm x10 bearing with a 30mm spread. This is a step in the right direction. Tapered roller would be even better.
Most sk8 axels need to more spindle area to accommodate.
The larger fulcrum from oversized thane and especially pnumatics should make us reconsider using stantard skate parts.
Bearing failure is somthing you shouldn’t have to think about when you step on your board.
That being said, always check bearings before you ride.