Replacement Trailer Tires ST225/75R15 for Sportsman 30 Foot 5th Wheel Trailer

Question:

I have a Sportsman 30’ fifth-wheel. The tires are Freestar M108 Radial S/T ST225/75R15. I cannot find a PSI listed. Any suggestions?

asked by: Ron

Expert Reply:

From what I can find online, the Freestar M-108 ST225/75R15 has 3 different load ratings available (C, D, and E). If your tires don't list the max PSI to inflate to on the sidewall, then there is really no way to confirm because there is not a set psi level for load rating or size of tire. Each tire is different.

The only thing I can suggest if the tire doesn't have the max psi listed on the sidewall is to replace the tires. I recommend the Provider ST225/75R15 Radial Trailer Tire - Load Range E # TR225LRE which are rated for 2,830 lbs at 80 psi and have a speed rating of 81 mph max. You always want to have your ST tires inflated to the max psi when filled cold.

expert reply by: Jason S