well, with my current setup, i'd guess i average about 13 mph on flats. where i live and have been training this is hard to gauge, since we have lots of crazy hills. some weekend soon, will drive the 2 hours to where it is flat and crank out 60 miles and see how i do. my friends i am training with are probably 2-4 miles an hour faster than me. i'm hoping to keep up better, without buying a new bike. i also want to enjoy myself on the STP and not have this become a death march.
i've got forte gotham tires on the bike now. not slicks, but way better than the knobby tires.