Patent ID: 6148886
Filing Date: 2000-11-21
Classification: B60C,Y10S

Abstract:
A pneumatic tire set comprising lefthand and righthand front wheel pneumatic tires and lefthand and righthand rear wheel pneumatic tires, wherein each of said front wheel pneumatic tires and said rear wheel pneumatic tires is constructed such that a plurality of righthand oblique groove groups each group of which has three or four righthand oblique grooves extending obliquely to a reverse tire rotating direction from a tread center portion to a righthand shoulder and a plurality of lefthand oblique groove groups each group of which has three or four lefthand oblique grooves extending obliquely to the reverse tire rotating direction from the tread center portion to a lefthand shoulder end are disposed alternately in a tire circumferential direction on a tread surface which has a tire rotating direction designated in one direction in such a manner that one main rib is defined in a zigzag shape in the tire circumferential direction by starting end portions of said righthand oblique groove groups and by starting end portions of said lefthand oblique groove groups and lefthand and righthand sub ribs are branched from said main rib along said righthand oblique groove groups and said lefthand oblique groove groups, respectively, wherein the oblique grooves composing said righthand oblique groove groups and said lefthand oblique groove groups individually have angles of 5 to 25 degrees with respect to the tire circumferential direction, and wherein thin grooves are formed in the sub ribs of the front tires but are not formed in the sub ribs of the rear tires ao that said rear wheel pneumatic tires have a smaller groove area ratio than that of said front wheel pneumatic tires.