Brand: Royal Black Model: Racing Trac Size: 275-30R21 275/30-21 275/30R21 275/30/21 275-30-21 275 30 21 2753021 Tread Depth: 7/32 Treadlife: N/A Season: All Season Performance: High Performance Car Type: Truck/SUV Load and Speed Rating: 102Y Speed Rating Description: Speed Rated Up to 186 mph Section Width: 275 Aspect Ratio: 30 Rim Diameter: 21 Production Year (DOT): N/A