My bike came with an Arione, otherwise known to me as Satan's perenium crusher and junk numbing tool.

http://www.specialized.com/us/en/ftb...es/toup-expert

THis is what I ended up with- I need the cutout, and not too much of a penalty with the Ti rails at 188g. Worked well so far but only a couple of 50+ mile rides on it, so IDK about farther than that.