Spinning Contest with 10 Lego Wheels

Which is the fastest Lego wheel? 10 participants are spun on a test rig and the winner is the one with the highest velocity. The score (linear velocity) depends on wheel size (circumference) and how fast it rotates (RPM measured using a laser tachometer). Enjoy! Participants: 1. Truck Wheel 2. Tractor Wheel 3. Oldie 4. Bigger Oldie 5. Balloon 6. Futuristic 7. Buggy Wheel 8. Monster 9. Cheap 10. Motor