The directional pattern of the 520 tire works well in intermediate to hard terrain. Reinforced knobs resist tearing and chunking. Tire designed with a high carbon compound, increasing wear life and minimizing knob edge tear / wear. Note: NHS (NOT for Highway Service). Tire Specifications: Speed/load rating: 33J. Permitted rim size (inches): 1.50 - 1.60. Outside diameter (inches): 15.31. Width (inches): 2.56. Maximum load (pounds): N/A @ 36 PSI. Construction: Tube type.