But it's true! It is about perpetual motion. I just know it!
On a fixed gear bike, your legs turn the pedals. But as anyone who has ever tried to stop pedaling a fixed gear bike knows, the bike makes the pedals go around.
So the faster you pedal the bike, the faster it moves the pedals around for you. So the faster you go, the more the bike starts pedaling itself. If you go fast enough, it just takes off like a rocket.
The oil companies and the Big Three auto makers do not want you to know about this unique feature of fixed gear bicycles, and that's why a brown GMC Suburban with Texas plates now follows me everywhere I go on my bike.