I think it is about 5500.

 

I'm 6'0" and the bike is very comfortable for me. The RR was fine for about 45 minutes, but after that i was ready to get back on my F4i (a friend and i traded on a trip). It doesn't put as much pressure on your back or wrists as the RR. If you only ride for short stretches i won't be too noticeable, but after 45min to an hour i prefer the F4i. The longest trip i've taken on it was about 1.5hrs and it wasn't bad...but much longer and i would have gotten off for a few minutes to take a break. The vibrating handlebars are the most annoying thing...and yeah, it's about 5500 at 70-75 mph, iirc.

I commute daily anywhere from 20-30 minutes each way and it's not uncomfortable at all. I think being taller might help...? Dunno.

 

I am also 6'2" and I must admit, I stay plenty comfortable on my F4i. Flat foot it easily, and like said before, even after long rides, my wrists and back are fine. (especially compared to when I ride my brothers RR)

You wont be disappointed with an F4i.