Patent ID: 7207366

Claim:
A two piece pneumatic tire comprising a carcass and a removable tread belt disposed radially about the periphery of the carcass, the tread belt and carcass meeting at an interface between a radially outermost surface of the carcass and a radially innermost surface of the tread belt, the radially outermost surface of the carcass and the radially innermost surface of the tread belt extending axially between two shoulders, wherein at least one of the radially outermost surface of the carcass and the radially innermost surface of the tread belt comprise a self lubricating rubber composition, the self lubricating rubber composition comprising at least one rubber and from 1 to 50 phr of at least one ester of formula II wherein R 1 and R 2 are independently selected from C 12 –C 36 alkyl, C 12 –C 36 alkenyl, or C 12 –C 36 alkadienyl; wherein (i) if the self-lubricating rubber composition is disposed in the radially outermost surface of the carcass, then the self-lubricating rubber composition in the radially outermost surface of the carcass is disposed axially proximate to a shoulder of the tire and is excluded from the radially outermost surface of the carcass axially distal to both shoulders, and (ii) if the self-lubricating rubber composition is disposed in the radially innermost surface of the tread belt, then the self-lubricating rubber composition in the radially innermost surface of the tread belt is disposed axially proximate to a shoulder of the tire and is excluded from the radially innermost surface of the tread belt axially distal to both shoulders.