Brand: Ironhead Model: Thrasher R/T RTD01 Size: 37-12.50R18 37-12.50-18 37X12.50R18 37/12.50/18 37-12.50-18 37 12.50 18 3712.5018 Tread Depth: 18/32 Treadlife: 45,000 miles Season: All Weather Performance: Rugged Terrain Car Type: Light Truck Load and Speed Rating: 128Q Speed Rating Description: Speed Rated Up to 99 mph Section Width: 12.50 Aspect Ratio: N/A Rim Diameter: 18 Production Year (DOT): N/A