Has anyone gotten a straight answer from the UCI about 34mm tires that fit the 33mm requirement or 32mm tires that measure 33.5mm. If I were to buy some 32's that didn't fit the requirement because of a 2mm manufacturing tolerance that would blow.... Are they measuring everyone's tires before a race?
You racing pro? If not, don't stress about it. You can always argue that the size printed on the tire should be the final word. I highly doubt that any USAC officials are going to be at races with vernier calipers.
1.3.018 Wheels of the bicycle may vary in diameter between 70 cm maximum and 55 cm minimum, including the tire.
For the cyclo-cross bicycle the width of the tire (MEASURED BETWEEN THE WIDEST PARTS) shall not exceed 33mm and it may not incorporate any form of spike or stud."
At the Ellison Park UCI race here in NY yesterday they had an official with a little welded jig that slid over the tires. They were checking all of our wheels and bikes in the pit. As long as the jig fit over the tire it was ok. I'll be curious to see what they have in Gloucester this weekend.