Toyo Tires Open Country A T III 35X12.50 R20LT, 121R Toyo Tire Open Country M T 33x12.50R18 Tire eBay Toyo Tires Open Country A T III 35X12.50 R20LT, 121R 35X12.50R18 118P TOYO OPEN COUNTRY M T 4X4 Parts. The Open Country M T is legendary for durability, off road performance, long tread life, and an aggressive tread pattern. Its designed to help trucks work hard on pavement and then work just as hard when roads are muddy, snowy, and rocky or when there are no roads at all. HIGH TURN UP, TOUGH POLYESTER CONSTRUCTION Contributes to excellent durability, impact resistance, and handling. AGGRESSIVE TREAD DESIGN WITH HOOK SHAPED BLOCKS Delivers excellent off road traction while maintaining great on road performance. DEEP SIPING IN THE TREAD BLOCKS Helps maintain grip on wet surfaces. OPEN, SCALLOPED SHOULDER BLOCKS Improves off road traction. Enhances grip in muddy, sandy, or snowy off road conditions. Ejects mud and snow through the open channels. OVER THE SHOULDER TREAD Helps to provide traction in deep mud and snow. Delivers improved off road handling in hard turns.