A vehicle is capable of maintaining a cooling capacity of a heat exchanger constant. The vehicle includes ahead pipe, a main frame connected to the head pipe so as to extend rearwardly and downwardly, an engine arranged below the main frame and including a cylinder having a cylinder shaft, which is inclined forwardly and obliquely upward at a predetermined angle, leg shields that cover the front of legs of a driver of the vehicle, a radiator arranged within the leg shields to cool the engine, and a reservoir tank arranged below a lower surface of the cylinder of the engine within the leg shields and connected to the radiator.