Updating my problem: frame and headset are still fine. Problem was actually on my helmet, squeaking from time to time. Go figure...After some 1600 miles, the first problem on my Ican A7. Not much related to the frame itself (or wheels, that I also bought from Ican): the headset bearings started to sign like a bird in some bumps on the road. I've heard that the bearing set they provided was not that great, but for free I couldn't complain much. They came with the frame and lasted more than a year.