The present invention relates to a pneumatic tire capable of improving
snow and ice performances as well as
noise performance. Shoulder pattern blocks are spacedly arranged on the
tread portion of the pneumatic tire along the circumference of the tire. The shoulder pattern blocks are formed and divided by a pair of shoulder longitudinal grooves extending at the side closest to the
tread ground end along the circumference of the tire, and by shoulder horizontal grooves extending between the
tread ground end and the shoulder longitudinal grooves. Multiple
reference space elements are configured and formed on the tread portion at two sides of the tire
equator respectively along the circumference of the tire. The
reference space element is formed by a space
reference line, the tread ground end and the tire
equator in a surrounding manner, wherein the space
reference line runs through an intersection point between the shoulder longitudinal grooves and the shoulder horizontal grooves at one side edge portion of the circumference of the tire and is orthogonal to the tire
equator surface. The
reference space elements include at least two reference space elements with different tire circumferential lengths. In addition, each reference space element at least has a pin hole for mounting a pin.