Wow. Can't believe the number of useful responses. I took a few of them to the bike store with the 2010 Opus Alto. Shorter top tube...yup. Longer head tube....yup. And for @alanknm, the 2010 and 2011 bikes are different. The 2011 is much more aggressive. There are two Retul fitters in my area (Greater Vancouver....scene of the very embarassing Stanley Cup riots). I will be taking the Opus for a test ride in the next few days, and will let you know the outcome. In the meantime.....thanks for the advice!
