Originally Posted by
halfspeed
The X2 is slightly lighter and has a different angle. The X4 may have matched your current stem's rise more closely than the X2. If you're concerned about the extra 20 grams, take it back to your LBS and exchange it for an X2. FWIW, the X4 is still very weight competitive with comparable "road" stems.
wait, um, road bars are standard 26.0 and 31.8...don't MB bars do like, um, 25.4? I don't think that you'll be getting that to work with a road bar...