Replacement Single Axle Trailer Tires ST205/75D15 and Prolonging Life of Tires  

Question:

Expert Reply:

A trailer tire with the size of ST205/75D, the D indicates that the tire is a bias ply tire. A bias ply tire is constructed so that the cords that run across the tire are at a 32 degree angle to the direction of travel, hence the D stands for diagonal. On a radial tire the cords will run at a 90 degree angle to the direction of travel.

For use on your single axle utility trailer I recommend using a radial tire, they run cooler and provide a smother ride. The typical application for bias ply tires are for off-road or farm usage. Due to their construction, bias ply tires provide a more rigid ride.

I suggest the Kenda Karrier # AM10245. This tire is a ST205/75R15, and is a Load Range D tire. This specific tire is rated for a load capacity of 2,150 pounds at 50 PSI, and fits 15 inch wheels. Kenda also offers a limited 2 year warranty on this tire.

The tire that you referenced is a different size tire, ST175/80D13. This is also a biased tire that has a D Load Rating. However, this tire is rated for 1,610 pounds. If you need a tire this size, then I recommend the Kenda Karrier # AM10210. This tire is rated for 1,610 pounds at 65 PSI, is a Load Range D tire, and fits 13 inch wheels.

Choosing a tire that has a higher load rating will not increase your trailer capacity but might contribute to longer tire wear. Please check the load rating of the wheels that you have and make sure that the wheel and the tire have similar ratings.

Since you are having problems with the longevity of the tires that you are using on your trailer I recommend checking the tire pressure regularly on your trailer tires. If the tires are under inflated or over inflated it will wear unevenly. Please note that it is always recommended to inflate your trailer tires when they are cold. Unlike automotive tires, trailer tires need to be maintained at their maximum air pressure shown on the tire sidewall.

You might also want to check and make sure that you have the correct ball mount height compared to to the trailer that you are carrying. If the trailer is not being hauled in a level position that could also cause additional leverage on the tires. This could result in unusual wear and failure of the tires. I have included a helpful article that shows how to measure for the correct ride height, and choose ball mount for your trailer.

Additionally, if you are not planning to use this trailer for other purposes in the off-season, you could jack the trailer up and take some of the weight off the tires (using jack stands or something similar). This will add longevity to the life of the tires, and keep them from having an uneven profile that could develop while they are sitting.

I have included links to the parts listed above, as well as a several helpful articles, and a product video for your reference.

expert reply by: Rachael H

0