I have a Specialized Roubaix Expert Disc, and wanted to do some light credit card touring on it last year, so I gave Wayne a call, at The Touring Store. He asked for pics, and set me up with a small Tubus rack with a seat collar and skewer attachment. It fit fine and seemed solid, but I moved overseas before I had a chance to use it. I suggest giving him a call - he will set you up.