Thanks to everyone who chimed in on this, and the comment that follows isn't meant to discourage further conversation:
One of my favorite things about BikeForums is how somebody can ask "hey, can someone else with these tires measure theirs and see if we match up?" and in no time at all we're on to rim variability, slicks vs tread, and muddy hydroplane simulations.
Still looking for a comparative measurement, but in the meantime I'm reading every word.
