I'm looking through the Nova Cycles site and am feeling like a bit of a math dummy.
If the outside diameter of a head tube is 31.7mm with 1.0mm walls, I would imagine that's a 1 1/8 inch head tube based on the following.
Inside Diameter = (31.7mm - (2 * 1.0mm)) / (2.54 * 10) = 1.169in
Then you would ream out the head tube to get to 1.125. However, I am seeing this listed throughout the site under the 1" head tube categories. Is there something I'm missing?