Patent ID: 7637296

Claim:
A vehicle comprising a first tire and second tire, each tire comprising: a pair of annular beads, a carcass reinforcing structure, an elastomeric sidewall extending radially outwardly from each bead adjacent the carcass reinforcing structure to a radially outer tread, the tread having only two circumferential tread zones which extend continuously around said tire, wherein said first circumferential tread zone has no lugs, and wherein said second circumferential tread zone comprises a plurality of lugs and a plurality of grooves which extend from a first end of said second tread zone to the sidewall, and a circumferentially continuous groove joining said plurality of grooves, wherein said tires are mounted within a rubber track having an interior center guide lug wherein the radially outer tread of the tire is in engagement with an interior surface of a rubber track and wherein the first tire and second tire are oppositely mounted on the vehicle such that the first zone of each tire is adjacent the center guide lug.