Center bore doesn't matter? Are you going to tell me that wheels are centered by lugnuts next? Laughable that you think .1mm is "close enough". No, it's not. It's not acceptable when the purpose of having wheels hubcentric is so the hub actually supports the weight of the vehicle and not the lugs. Also, don't lecture me on runout, it's the exact definition of runout when you have two circular mating surfaces which are designed to rotate on the same axis. Non hubcentric wheels will give you unacceptable lateral runout on your wheel and a wheel vibration. It would be similar to the hub/bearing assembly itself having out of spec lateral runout. Like I said, if manufacturers claim that acceptable runout for a hub assembly is .05mm and you install a wheel that has a .1mm larger diameter hub bore your assembly is out of spec per the manufacturer. I can assure you that .1mm is a big deal when it comes to hub bore on wheels.But center bore diameter has nothing to do with runout.
I think you may have a flawed understanding of what runout is and perhaps ought to google a description of that term before randomly tossing it into a discussion.
Runout, in this usage, is how flat, in layman's terms, the hub face is while turning. It can be affected by multiple issues such as a poorly machined hub face, a worn wheel bearing or a damaged spindle to name just a few of the more common causes.
Center bore is literally the center bore of the wheel and by the laws of nature MUST be larger than the diameter of the hub center or you will never get the wheel on.
Center bore definitely need not be that tight, heck, it doesn't even have to be close as you can use plastic rings, or just the conical face of the lugnuts tightening into the conical seats in the wheel to align the wheel closely enough to the hub center.
If spec on center bore demanded only a 0.05mm tolerance you would likely need to heat the wheels up and cool off the hub just to gain enough clearance to install them, and any dust or dirt would probably be enough to bind it up or cause galling.
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