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Snappy. That's the best way I can put it. I'm coming off of a Cannondale Optimo CX. That bike flexed when you really were stomping on the pedals. It was most noticeable when the fenders were mounted in the rain. The wheels would rub when you were climbing. With the Tarmac and it's ridiculously large bottom bracket shell I went out for an easy spin this weekend with Martin and on the first climb I stood up, stomped and pulled on the pedals and the bike accelerated without any hesitation or loss of power. It just snaps forward when you pedal. Even though I felt like shit I zipped right up the climb. It's probably something best explained first hand. Overall it's just a fun ride and gives me a shit eating grin every time I ride it.
P.S. I scored some speedplay x1 pedals ($325 new) for $40. Long story short. Someone thought they were worn out and they aren't. Not even a little. Pedals are almost as cool as the new bike. Especially coming off a lifetime of riding sloppy mtb pedals.