VEX has the right tire for any terrain. Three different size wheel diameters (70mm, 100mm and 127mm) are included in this kit, each with a different tread type; choose the perfect wheel for your application. 2 x Intake Rollers 4 x 70mm (2.75 inch) Wheels 2 x 100mm (4 inch) Wheels 2 x 127mm (5 inch) Wheels