A tread surface 2 is divided by inner and outer longitudinal grooves 3a and 3b located on opposite sides of the tire equator into a central land portion 4i, intermediate land portions 4m and shoulder land portions 4o. The intermediate land portion 4i includes an inclined grooves 9 having an angle .theta. with respect to the circumferential direction of the tire, and the angle is increased from an inner end (mi) away from the inner longitudinal grooves 3a by a small distance La to an outer end (mo) where the intermediate land portion intersects with the outer longitudinal grooves 3b. An angle .theta.i in the inner end (mi) is 0 to 25.degree., and an angle .theta.o in the outer end (mo) is 60 to 80.degree.. A pitch P1 of the inclined grooves 9 in the circumferential direction is greater than a pitch P2 of lug grooves 5 provided in the shoulder land portion 4o in the circumferential direction.