Wheels are too small to really be efficient though. And thats what I'm saying. You'll tire faster because you have to work harder, with smaller and wider wheels that have more rolling resistance. And with the same gearing that I have on my fixed gear, I've never gone as fast on my old BMX bikes than I do now. The seating position is designed specifically to maximize the performance of your legs and puts you in a more aero dynamic position, again putting less resistance on your body.