Power King Towmax STR II ST175/80R13 Tires

Power King Towmax STR II ST175/80R13 C 91/87L is a trailer tire.

Power King Towmax STR II ST175/80R13 C 91/87L Tire Specs

ST175/80R13 is a Special Trailer tire. It also comes in a Metric (175/80R13) and a P-Metric (P175/80R13) variant

Let us decode each aspect of the tire size code to have a full understanding what this tire size means.

ST indicates that ST175/80R13 is a trailer tire.

175 is a section width of the tire from one sidewall to the other. Tire tread width is typically a bit narrower than the section width. Section width of ST175/80R13 tire is 175 millimeters.

80 represents the aspect ratio of a tire, which is a ratio of the tire's sidewall height to its width. For ST175/80R13 tire, the sidewall height is 80% of its tread width.

R denotes that ST175/80R13 tire has radial construction.

13 represents the wheel diameter in inches that the tire is designed to fit. ST175/80R13 can be mounted on rims with 13 inches in diameter.

C denotes the load range of a tire. Load Range C is equivalent to a 6-ply rating, but the actual number of plies in the tire may vary. These tires are generally rated for a maximum inflation pressure of 50 psi, and are commonly found on light-duty trailers, smaller RVs, and some light trucks. They are designed to provide a good balance between load-carrying capacity and ride comfort.

91/87 indicates a dual load index, meaning a tire can be used in a single or a dual application. For a single application, load index of 91 can support a maximum load of 1356 pounds or 615 kilograms per tire. For a dual application, load index of 87 can support a maximum load of 1201 pounds or 545 kilograms per tire.

L indicates the speed rating. A tire with a speed rating of L is approved for speeds up to 75 miles per hour or 121 kilometers per hour under optimal conditions.

Tire manufacturer part number (MPN) is MAX13T.