Originally Posted by
sfrank
I have a 2012 DS 8.4 with a 17.5 frame. It fits me fine and I'm 5'10" with a 29 inch inseam. I put an adjustable angle bar stem on it after I bought it and it is much more comfortable to ride. I'm with most of the others in saying that the larger frame would be too large but wait and try it out before you buy.
Please keep in mind the 2012s had different geometry, most notably longer ETT so if you were to rebuy today you
may well find yourself on the 19.5.