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0.2mm is the difference between absolutely won’t press in and rattling around loose - what’s going on there?
According to this article, 0.0007” or 0.017mm is the difference between press fit and slip fit.
It also mentions that the parts need to be trying to occupy the same space, so King probably don’t suggest a 33.9mm headtube id because their headset cup od is 33.9mm but rather because their headset cup od is 40mm and they want 0.1mm of interference.
M_V
Shimming is not a bodge.
I’m more concerned, like you, that there are different sized reamers for what should be the same size hole. 0.2mm is the difference between absolutely won’t press in and rattling around loose - what’s going on there? I’m also massively surprised the King headset has cups apparently 0.1mm smaller than standard. That’s completely bonkers, why even have a size standard if it’s not going to be used?