Originally Posted by steelbikeguy

I used to have some Nisi dark anodized tubular rims with that sort of wear pattern, but the spokes pulled through the rear rim when it cracked. Not sure how many miles they had... but they showed considerably more wear than your rims.

My current experience is with MA-40's, where no trace of anodization remains. These rims must have 20 or 30 thousand miles on them when the photo was taken over 10 years ago?? Not a lot, by my standards. The anodization probably didn't last more than 5 or 10 thousand miles, but the bike gets ridden in the rain a lot too.
This is the best photo that I've got handy, and it shows the bare aluminum sidewalls on the MA-40's.



Steve in Peoria