I think that I figured it out. The maximum hub height refers to the maximum distance that the stock hub can extend without the spacer bottoming out on the leading edge of the hub such that the spacer will not fit flush. I suspect that it's not an issue with the wider spacers since there's enough clearance because of the added width that the spacer will not bottom out. Not sure if the 10 mm spacers have ever proven to be problematic in terms of fit on the Z. I'll simply have to check the hub height when I pull the wheels off.
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