The Power King Boat Trailer II is an economical bias-ply tire for small to medium trailers of all types. It has the traditional sawtooth circumferential rib tread pattern most common on trailers designed for hauling on paved roads. Also, the bias-ply casing has the advantage of a thicker sidewall vs radial tires. This makes the Power King Boat Trailer II extra robust and resistant to road hazards and pot holes that could lead to flats.