I did measure it 10 months ago. It's about .01 mm thinner; I wouldn't trust a measurement this precise because I don't measure in the exact same spot. I hypothesize that it hasn't so much thinned over the last 10 months as that it has weakened from bending. 2 years ago I had a bulge in a different spot on the rim, which I squeezed back to flat, which hasn't bulged out again.

This rim has a wear indicator? A few months ago Sun's website's entry about it doesn't mention that.