It is the brace. The seat has a tongue in the front. And will be on a seat hoop welded to the frame. The post is a creative way to get a cantiliver look. The seat is quite a bit longer than my bum so most of my weight will be foreward on the tongue, and hoop weld area. We are still in the mock up phaze and its tacked on. Our other option would be to bring two braces up from the rear frame to the seat hoop. We were just going for max visual impact. 16gage Steele, feels solid?