This chainring has been on the bike since a got it a few years ago. I put a lot of miles on it and there are no problems really. I have a brand new one and when I compared the teeth, they look a bit thinner when looked from the side. Also, the new one seems to tighten the chain slightly when it's on. Like it has an extra tooth (they are both 52). I guess that shows that's it's got a bit of wear. I don't mind that, except that maybe it could wear the chain quicker if it's a bit worn.