The NMB bearing are ok up to 100K RPM (to be confirmed).
The castle rotor is ok up to 60K RPM, maybe more, there is always a safety gap I think....
But if the rotor blows at 65K RPM, there is maybe a critical risk to damage the ESC too.
Inferno VE MMv3 NEU-CC 1515/1Y 4S "Flying machine"