Patent ID: 6012499
Filing Date: 2000-01-11
Classification: B60C,Y10S

Abstract:
A pneumatic tire comprising; a tread portion having a plurality of inclined grooves which extend outwardly respectively from an inner side of the tire in the width direction to an outer ground contact side oriented at an angle of more than 45.degree. to the tire rotational axis and arranged at intervals along the tire circumferential direction, and a plurality of blocks which are defined by said inclined grooves and by a plurality of connection grooves connecting with said inclined grooves to define a high angle unidirectional block pattern, said inclined grooves coming into contact with the ground in order beginning with the inner side to the outer side, wherein the side wall portion of a block facing a first inclined groove coming into contact with the ground is precedingly more rigid than the side wall portion of said block facing a second inclined groove coming into contact with the ground following the first inclined groove, and the side wall portion of said block located at the inner side in the tire width direction is more rigid than the side wall portion of said block located at the outer side, and wherein angle .alpha.1 which is formed between the tread surface and the side wall portion of the block facing the first inclined groove and angle .alpha.2 which is formed between the tread surface and the side wall portion of the block facing the second inclined groove satisfy the following expression: .alpha.1 >90.degree..gtoreq..alpha.2, and angle .beta.1 which is formed between the tread surface and the side wall portion of the block located at the inner side and angle .beta.2 which is formed between the tread surface and the side wall portion of the block located at the outer side satisfy the following expression: .beta.1>90.degree..gtoreq..beta.2.