I just got a 2013 DS8.3 17.5" frame and it has two mounts, both on the down tube. The one on the underside is between the cables. I love the bike so far(I've only done one 10 mile ride). I test rode an 8.4 and I was just blown away. That bike is awesome but it was even farther out of my price range than the one I bought. :-)