A pneumatic tire has a rubber member at least partially constituting a tread portion, which member is formed of at least two layers of an outer layer on a tire surface side and an inner layer on a carcass side. A blended amount (X) of an antioxidant in the outer layer is in a range of 0.4 1.6 weight % of an entire composition, and the blended amount (X) of the antioxidant in the outer layer and a blended amount (Y) of the antioxidant in the inner layer satisfy the expression: Y.gtoreq.-0.4 X.sup.2+2X. Thus, a pneumatic tire suffering less rubber degradation and alleviated in discoloring of the tire surface in prolonged use is provided.

 
Web www.patentalert.com

< Two-piece solid golf ball

< Golf ball

> Golf ball and method of manufacturing the same

> Golf club head

~ 00283