Originally Posted by
europa
Mate, if it's new, leave it alone. Shimano keep improving their kit every year and I think you'll find that the current Tiagra is pretty darned good. Use your money to build a companion bike for the Roubaix, do up an old bike or build a shopping bike or something
To this point....my Masi came with Dura Ace about 7 yrs. ago. Very nice kit. This year I bought a cyclocross bike with 105. The 105 shifts smoother than the old DA.