A little while ago, was riding the X on a fairly rough road. Was standing up most of the time. Hit a couple of really hard bumps, but think much about it until I sat down. The seat didn't feel right. It felt like it was lower in the rear. Stopped for a look and the whole back end felt loose. After limping home, looked for damage. Found this: Emailed the pictures to my dealer and called to see if they would cover it under warranty. They told me they would have to have me bring the bike in for them to look at before they would even decide if the warranty would cover it. I offered to pull the sub frame off and send it to them, but they insisted on have the whole bike. With the dealer 250 miles away and looking at at least two or more trips and then they might not ever cover it, decided to repair it myself. Worthless warranty. Pulled the sub frame off and took it to a friend of a friend who happens to be one of the best aluminum welders around. He did a nice job repairing it. Put everything back together today. Decided I needed to add some bracing to the rear of the luggage rack to keep from breaking the sub frame off again. Welded some tabs to the bottom of the luggage rack and built some mounts that bolt to the spots intended for buddy pegs. As soon as I can buy some aluminum channel I will run some from the new tabs on the back of the rack to the new "buddy peg" mounts. This should transfer some of the weight on the luggage rack directly to the lower part of the frame and prevent the sub frame from breaking off again. Will try to post some pictures when I get it finished. Wondering if anyone else has had problems with the sub frame breaking off? It can happen.