yah plus the tires spin alot faster, those cars do not weight much at all, which is why they can get such huge launches off those little hills, you dont need torque in those little cars so u lighten the peices, such as flywheels, engine components and so forth, so with tiny wheels u can get amazing speed to the ground, when with a larger wheel with a bigger diameter u have a better top speed which is not so great on a track where changing quickly from 20mph-70 mph is ur greatest concern, lighter wheels with smaller diameters make it possible to have closer gear ratio's, higher rpms, and less chances of serious stress on an already stressed engine, better to let the wheels spin a whole lot and let the driver make up for wheel spin and keep control of those cars, plus awd makes a huge difference