Brand: National Model: Road Max ST Size: 185-80R13 185/80-13 185/80R13 185/80/13 185-80-13 185 80 13 1858013 Tread Depth: 8/32 Treadlife: N/A Season: All Season Performance: Highway Car Type: Trailer Load and Speed Rating: 99/95M Speed Rating Description: Speed Rated Up to 81 mph Section Width: 185 Aspect Ratio: 80 Rim Diameter: 13 Production Year (DOT): N/A