You mention an alternate bearing - for the "poor mans belt wrap pulley" rated to 18,000rpm
Nachi 6203ZZE

Given I'm moving towards 178+65C3, I'm Just trying to get my head around the function of the pulley bearing before I swap it.
My understanding is that the SC pulley bearing is only called upon the do its job when the supercharger is not engaged by the clutch. Given that such a case at high rpm is only going to happen on the very odd occasion of an a ECU trip on high AIT or similar = disengage SC clutch = a high speed bearing is not essential in this particular case....sound fair or am I totally a$$ about.