The SuperSix has been good to me. A few years ago when I got it I was battling some horrific low back pain. My back is stronger now and I ride both the SuperSix and a Spec Crux EVO (56cm).
I have no idea how to compare or interpret the SuperSix geometry to the Tarmac geometry. What should I be looking for? And yes, I will go ride the Tarmac before buying it.
I bought the new Tarmac Pro Disk Race UDi2 about a month ago. Before, I had the High Mod Carbon Super Six for about five years. Both are 52 cm frames. I have not studied the differences in geometry, however, the Tarmac is definitely twitchier. Having said this, I really like the ride of the Tarmac even though it requires a bit more attention the SS.
I don’t mean to imply anything negative by saying twitchier. The Tarmac is stable on descents and under other circumstances. The frame/fork just seems to be slightly more sensitive (responsive?) than the SS. That’s a good thing in some ways and not as good in other ways. For example, I might find myself riding into a ditch a little easier on the Tarmac than on the SS if I’m daydreaming or not paying attention. The bottom line as far as I am concerned is that they are both fantastic bikes.
I forgot to mention that the quality of Roval wheels seem to be as good as my Zipp’s or Bontrager’s and yes, the Tarmac climbs at least as well as the SS.