On a flat, with no headwind, you shouldn't be too pressed to push 20-22. Throw a headwind in, and things change drastically, and you'll find yourself loosing 2-4mph. On the other hand, make it a tailwind and you can push 25+ Just make sure to yell "On your left" every time you pass an MTB. Some of those guys spook when you go by them so fast. Oh, and if you want to have fun, slow down and pass them slowly, then ease the pace back up, checking behind you for an explosion, as they blow up trying to hang.