Brand: Arroyo Model: Grand Sport A/S Size: 255-40R21 255/40-21 255/40R21 255/40/21 255-40-21 255 40 21 2554021 Tread Depth: 7/32 Treadlife: 40,000 miles Season: All Season Performance: High Performance Car Type: Truck/SUV Load and Speed Rating: 105Y Speed Rating Description: Speed Rated Up to 186 mph Section Width: 255 Aspect Ratio: 40 Rim Diameter: 21 Production Year (DOT): N/A