x2 3137C01ASSY2BlackBrick, Modified 2 x 2 with Wheels Red for Single Tire with Black Tires 15mm D. x 6mm Offset Tread Small (3137c01 / 3641)
x4 4180C02ASSY1BlackBrick, Modified 2 x 4 with Wheels, FreeStyle Red Wheels and Pins with 2 Black Tire 24mm D. x 8mm Offset Tread - Interior Ridges (4180c02 / 3483)