Pneumatic tires

Claim 1

A pneumatic tire for use in a lubricated tire and wheel assembly capable of operation in a totally deflated condition which comprises a tread, braced by a breaker assembly, sidewalls and beads; said sidewalls hving smooth continuous interior and exterior surfaces and being arcuate throughout their extent and extending radially and axially outwardly from the beads to the region of maximum width of the tire, substantially midway between the beads and shoulder, then curving axially inwardly from that region and terminating at the shoulder, the sidewall rubber having a hardness between 45 and 65 Shore A and a rebound resilience of at least 85% measured at 50° C. by the Dunlop Pendulum method; a reinforcing carcass in the sidewalls, said carcass having cords extending in substantially radial planes, the width of said tread being at least 35% greater than the distance between the heels of the beads of the tire when inflated, the sidewalls each having, at their thinnest point, a thickness of at least 5% but not more than 10% of the overall width of the tire, at least 25% of said sidewall thickness consisting of rubber on the interior of the carcass of the tire, the tire having an aspect ratio, when inflated, of less than 75% and the part of the sidewall which is thinnest being immediately adjacent to the region of maximum width of the tire and having in that region substantially equal thicknesses of rubber on each side of the carcass, the thickness of the sidewall increasing from there towards the tire shoulder, at least 25% of the thickness of the sidewall in the entire region of the sidewall between the thinnest part of the sidewall and the tire shoulder comprising rubber on the inside of the tire carcass cords such that the carcass plies are positioned at or close to the center of the sidewall throughout said entire region.