Brand: Goodyear Model: Eagle F1 SuperSport R Size: 315-30R21 315/30-21 315/30R21 315/30/21 315-30-21 315 30 21 3153021 Tread Depth: 8/32 Treadlife: N/A Season: Summer Performance: High Performance Car Type: Racing Load and Speed Rating: 105Y Speed Rating Description: Speed Rated Up to 186 mph Section Width: 315 Aspect Ratio: 30 Rim Diameter: 21 Production Year (DOT): N/A