Brand: American Roadstar Model: Sport A/S Size: 255-40R18 255/40-18 255/40R18 255/40/18 255-40-18 255 40 18 2554018 Tread Depth: 10/32 Treadlife: 40,000 miles Season: All Season Performance: High Performance Car Type: Passenger Load and Speed Rating: 99Y Speed Rating Description: Speed Rated Up to 186 mph Section Width: 255 Aspect Ratio: 40 Rim Diameter: 18 Production Year (DOT): N/A