I just picked up my 2013 DS 8.4. It is a 21" frame and has mounts on the down tube and the seat post tube. One thing I have seen complaints about is the lock out cap popping off. I can verify that within 4 minutes of riding the bike it did. I pulled into my driveway and there is a dramatic incline from the road. I had the cap in the locked out position and as soon as I hit the driveway, the cap went flying off. Very disappointing. I can see this cap is going to go missing. I am thinking about taking a small piece of Kevlar string and attaching it to the cap with a drop of super glue and attaching the other end to the frame. That way when it does pop off again, it won't be lost. I absolutely love everything else about the bike, I just can't believe they haven't figured out how to keep that cap from popping off.