Patent ID: 6983775

Claim:
A two-piece tire assembly having a removable tread belt for installing about the circumference of a tire carcass and a tire carcass having an inflated and unloaded outer circumferential surface having an axial dimension no greater than the axial width of the removable tread belt, the two-piece tire assembly being characterized by: the carcass having a radially outermost and the tread belt having a radially innermost layer made of tread rubber, each tread rubber layer forming an abrasion resistance surface between the tread belt and the carcass, the tread rubber comprising per 100 parts by weight of elastomer (phr): from about 50 to about 100 phr of natural or synthetic polyisoprene; from about 0 to about 20 phr of a polybutadiene; from about 0 to about 50 phr of a styrene-butadiene rubber; and from about 10 to about 100 phr of a filler selected from carbon black and silica; wherein said tread rubber has a modulus ranging from about 4.6 to about 11.5 MN/m2; a tensile strength of from about 12 to about 24 MN/m2; and an elongation of from about 525 to about 625 percent.