We ran some traction testing tonight. 2 Vex robots, same frame, same wheels, the robot on the left is four motor drive, one motor per set of tandems wheels. The robot on the right is four motor drive, two motors into a 1:3 sprocket to wheel ratio. The wheels on the robot on the right turn 300 rpm, the left robot 100 rpm. We ran the test on a piece of FRP. The weight of the robots was the same, except for the extra tandem wheels.
The robot on the right won every time. Why?