My rubber band racer is based off  the car Herbie from the movie Herbie. My car has four black wheels. The two in the back are the bigger ones and the one in the front are the smaller ones. I also put hot glue on the wheels for more traction. Sadly Herbie only went 87 inches, but some advice I would give to improve your car is to make it bigger so the rubber band can stretch farther out and the car will go farther.