In Reply To:
Thanks Alan. I'm curious too, since this "Depth of Tire Bed - 4.6 mm" is precisely what is VERY different than what Josh measured. The wheel you have is the only one that the guys at Zipp have been able to find. Though also narrower than what Josh found on that wheel, and seemingly narrower than the wheel that bartturner has (though not sure what he used to measure it).
Since you highlighted the Depth of the Tire Bed I remeasured - it is actually closer to 5.0 mm. There is some residual glue on the rim which I didn't bother to correct for. I'll fix that above as well.
I have a Vernier caliper as well but with a mechanical dial readout.