Industry-leading 60,000 Mile (P Metric sizes) and 55,OOO-mile (LT Sizes) Limited Tread Wear Warranty!. Mickey Thompson is proud to introduce the new Deegan 38 All-Terrain. The Deegan 38 A/T will debut in 29 popular 15-to 2O-inch sizes for light truck, SUV and 4X4. Mickey Thompson® Deegan 38™ All-Terrain Tire; Size 35x12.50R20LT; 121R; Speed Rating R; Load Range E; 35X12.50R20LT 121R DEEGAN 38 A/T