FREE COUNTRY ST205/75R15 Trailer Tire
Updated June 13, 2026
The FREE COUNTRY ST205/75R15 is a radial trailer tire designed for boat, utility, and RV trailers. It is offered in 8-ply (Load Range D) and 10-ply (Load Range E) configurations, with an optional integrated Scuff Guard ring that protects the tire sidewall and rim from curb damage and abrasion. The tire is intended for trailer use only and is available as a standalone tire or mounted on a wheel assembly.
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How It Works
This tire is a Special Trailer (ST) radial, meaning its construction and materials are optimized for the heavy, steady loads and higher sidewall stiffness required by trailers. The 8-ply or 10-ply rating provides increased load capacity and puncture resistance compared to passenger tires of the same size. The Scuff Guard feature is a raised rubber ridge on the sidewall that acts as a sacrificial wear indicator, protecting the tire structure from scuffing against curbs or debris during maneuvering.
Common Failure Symptoms
Common issues include sidewall cracking from UV exposure or age, tread separation due to overloading or underinflation, and flat spots from prolonged stationary storage. Irregular wear can indicate misalignment or unbalanced loads. The Scuff Guard may become worn or chunked off, but this does not necessarily compromise tire integrity unless the main sidewall is damaged.
Installation Notes
Mount only on trailer axles; do not use on passenger vehicles. Ensure the tire's load rating (D or E) matches or exceeds the gross axle weight rating (GAWR) of your trailer. Inflate to the pressure specified on the tire sidewall. When replacing, always replace in sets of two or more for balanced handling. The tire can be installed on 15-inch rims with a 5-lug 4.5" or 5" bolt pattern depending on the assembly variant.
