either one of the front or rear pairs of wheels, a seat located in between the front and rear pairs of wheels, wherein a main portion of the power unit is located between the second transversal axis and an imaginary axis located at a median point between the first and second transversal axis.
In a preferred embodiment, the power unit comprises a crankshaft and a transmission shaft extending in a running direction of the vehicle, and wherein a rear drive shaft is connected to a rear end of the transmission shaft on one end and to a rear differential on the other end to allow the power unit to transmit power to the pair of rear wheels. Most preferably, the vehicle also comprises a front drive shaft connected toa front end of the transmission shaft on one end and to a front differential on the other end to allow the power unit to transmit power to the pair of front wheels.
In yet another aspect, the invention provides a saddle-type vehicle comprising a frame, a pair of front wheels suspended from a front portion of the frame, a pair of rear wheels suspended from a rear portion of the frame, a power unit mounted on the frame, a fuel tank, a transmission allowing the power unit to transmit power to either one of the front or rear pairs of wheels, a seat located in between the front and rear pairs of wheels, wherein a main portion of the fuel tank is disposed substantially below the horizontal plane