Originally Posted by
hnsq
I had the same problem with the Cannondale Cross bike I picked up for commuting...I ended up buying one of these

and after that I could mount a rack like normal.
It works great, got it from
http://www.treefortbikes.com
That looks really interesting - any chance you could tell us what it's called or link directly to it? I went to the website, but couldn't find it.