How is your old S-Works SL3 compared to this?
Also, since it's the first Zero7 in this forum you may upload it here: viewtopic.php?f=10&t=56269&hilit=wilier
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Honestly, I'm not a Specialized hater by any means, but it really isn't any comparison. The first time I took the Zero.7 out for a ride on my regular route, I went faster than I'd ever done it on my SL3 with basically the same components. I averaged almost a full MPH faster. Now you can chalk that up to having a favorable wind that day or whatever but I've since had my second, third, fourth and fifth fastest rides all on the Zero.7. And this is a flat route essentially. The BB is so incredibly stiff that you feel like every ounce of power you put into the pedals and cranks is not wasted. Maybe that's marketing speak that got into my head, but it truly just kills. And climbing on this bike? I'm not the best climber in the world as I'm 180 pounds but the bike just jumps up hills.
The other thing is it is incredibly comfortable. I imagine something so stiff would not be comfortable but it's insane. I'm doing a century in March so I'll definitely report back then but for 2-3 hours rides, it's been a dream.