I was surprised, too, at the amount of wear on the teeth of the middle chain ring! It's gets used about 95% of the time when I commute. I'll have to keep a better eye on it.
The good news is the ticking noise is gone and the bike looks brand new!
The inner chain ring I was using had 26 teeth. Peter White recommends a 20 or 22 tooth inner ring for the Atlantis, but I couldn't find one locally (not even a 24 toother), so I put the old one back on for now. No one had a 36 tooth ring to replace the worn middle ring, either. So I settled for a 34 tooth black one.
