I'm curious now if any of the Trek mountain bikes had the one piece headtube/lug construction like some of the road frames. That does look like it started right at that joint, in the one piece headtubes that would not be a joint at all.
Edit: Seems maybe this is a cast one piece unit and the fake lug edge can cause a stress riser?
Last edited by wesmamyke; 10-29-22 at 07:22 PM.