Not trying to hi-jack your post, but I've got the same problem. I was going to post the same question in a couple of days. My hardtail is nice and square with the rest of the frame, the sprockets are lined up, and the rear wheel is about 1/2 to the right. Right now I'm running a bsa quick detach 16", but I had the same thing with the 19" quick detach wheel.wtf?