2WD Chassis Mounted on Big 115mm Diameter Tires The durable and easy-to-assemble 2WD chassis employs a box type frame, and features front independent swingarms and a rear rolling rigid suspension. Big 115mm diameter tires offer dynamic running on even the toughest of surfaces. Sealed gearbox protects the diff gear from dirt and sand during off-road driving. Rear mounted wheelie bar enables wild stunt driving.