Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Great project. I did this a few years ago when DA went to 10 speeds, I got a screaming deal on a 9-speed group from the LBS. I let the professional wrench put the DA group on the "good bike" and put the replaced Ultegra group on the "backup bike."
It's a fun winter project and you'll learn a lot about how your bike works.