Stack double tire

To provide a stack double tires which can ensure high steering stability by suppressing the adhesion of the studs of ice particles generated during ICE road travel. A provided a tire tread extending in a tire circumferential direction circumferential grooves and studs which stud holes 9 in the land portion which is defined is formed by a lug groove extending in a direction crossing these circumferential grooves in twin wheels, the trailing side of the region R surrounded radii of different two circles C .Field