What is an ST tire?
Tires on boat trailers have to be ST tires which stands for Special Tire. ST tires are designed specifically for boat, car and utility trailers. They are built to carry heavy loads on non-powered axles and are rated for a maximum speed of 65mph. Their stiff sidewalls help prevent your boat/trailer towing package from swaying. ST tires have 10% more load capacity than equivalent light truck (LT) tires and 40% more than passenger car (P) tires.
Venture Tip: Never substitute light truck (LT) or passenger (P) tires for trailer tires.