The legendary Trakmaster continues to be known for great value. Hit the trail and don't be afraid to take it to the road between trails. Tall aggressive knobs designed for varying terrain. DOT approved (90% / 10%, dirt / road application). Durable compound for extended tread life. Classic design at affordable price. Tube type. Tire Specifications: Speed/load rating: 50M. Overall diameter (inches): 18.30. Section width (inches): 3.10. Maximum load (pounds): 419 @ 33 PSI. Tread depth (mm): 10.00. Weight (pounds): 4.56. Construction: Tube type.