205-75-14 Trailer Tires

Different trailers are used for different purposes. The one thing they have in common is the need for specially designed trailer tires. Using tires specifically designed for this purpose is wiser and safer than using improper tires.

How are trailer tires different from other tires?

Special trailer (ST) tires are intended specifically for use on utility trailers. They differ from passenger tires by having stiffer sidewalls and greater inflation pressure, which offer greater stability to reduce trailer sway. Trailer tires are also made to be heavy duty and are designed for heavier loads. Passenger, and even light truck, tires permit an unsafe amount of sway if used on a utility trailer, especially when rounding a curve or turning a corner.

How do you know a tire is right for trailers?

The words "Trailer Use Only" or the initials ST, for special trailer, printed on the sidewall indicate that it was manufactured especially for use on utility trailers or RVs.

What’s the difference between bias ply and radial trailer tires?
  • Trailer tires marked D, for diagonal, are bias ply. Bias ply are stiffer than radials and are a better choice for short trips and stop-and-go city traffic.
  • Tires marked R are radial. Radials provide less heat buildup and greater load capacity and are a better choice for heavier loads hauled over longer distances.
How can you be sure trailer tires are properly inflated?

Inflation should be checked before a trip while the trailer tires are cold because tire pressure increases during travel due to the buildup of heat. Wear patterns will change with either proper or different kinds of improper inflation.

  • Excessive wear down the center indicates over inflation.
  • Excessive wear on the outside edges indicates under inflation.
  • Properly inflated tires will wear evenly across.
  • Care should be taken in checking the valve stem. Bend the stem, and listen for any leaks. Use a sponge to apply soapy water to the valve stem, then bend it back and forth and watch for air bubbles.
What is a load range?

The load range refers to the heaviest load the tire is designed to handle. Load ranges run from load range B for light loads to load range E for the heaviest loads. You should always ensure the tires you purchase have a load range that matches the maximum load your trailer is designed to haul.

Do trailer tires need to be balanced and rotated?

If they are inflated properly, trailer tires do not need to be rotated unless you are seeing uneven wear patterns.