My Roubaix has a Specialized stem and the bars are in some kind of shock-absorbing polymer sleeve, inside a metal shim but I'm pretty sure they are still a standard size (can't actually remember what that is at the mo). I bought some cheap flat-top bars from eXotic but they didn't fit perfectly in the stem clamp and tightening the bolts would have deformed them so I sent them back. So now I'm resigned to spending proper money on some decent bars from Easton or FSA or some other manufacturer. (BTW I'm talking here about drop bars with a flattened section along the tops, not straight bars!) Any recommendations?