Everything You Need to Know About Trailer Tires in One Guide

Trailer tires are one of the most critical components of any towing setup, yet they are often misunderstood. Choosing the right trailer tires is essential for safety, performance, and longevity. Whether you are hauling equipment, towing a camper, or pulling a utility trailer, the correct tire ensures a smooth and trouble-free experience.

In this guide, we will break down everything you need to know about trailer tires, including sizes, types, and top manufacturers. We will also explain the difference between radial and bias tires, ST vs. LT ratings, and key factors to consider when replacing trailer tires.

 

Trailer Tires vs. Regular Tires – What’s the Difference?

One of the most common mistakes trailer owners make is assuming they can use the same tires as their car or truck. However, trailer tires are specifically designed to handle heavy loads and long hauls.

  • Trailer Tires (ST – Special Trailer): Built with stronger sidewalls to prevent swaying and improve stability. Designed for load-bearing capacity rather than comfort.
  • Passenger (P) or Light Truck (LT) Tires: Made for steering and traction, not for carrying heavy, non-driven loads like trailers.

Using the wrong tire can lead to excessive wear, poor handling, and even tire failure.

trailer tires, auto repair in Locust, NC at Whitley Automotive. Tires neatly stacked on racks in a tire shop.

Trailer Tire Sizes – What You Need to Know

Finding the right trailer tire size is essential for performance and safety. Tire sizes are typically labeled on the sidewall in a format like:

ST205/75R15

Here’s what it means:

  • ST – Special Trailer tire
  • 205 – Width of the tire in millimeters
  • 75 – Aspect ratio (height of the sidewall as a percentage of width)
  • R – Radial construction
  • 15 – Wheel diameter in inches

Popular Trailer Tire Sizes

Some of the most common trailer tire sizes include:

  • ST175/80R13 – Small utility trailers, boat trailers
  • ST205/75R14 – Medium-duty trailers
  • ST225/75R15 – Heavy-duty trailers, RVs, car haulers
  • ST235/80R16 – Large commercial trailers, equipment haulers

Larger Trailer Tire Sizes for Extreme Loads

  • ST235/85R16 – Offers slightly more height than the ST235/80R16, providing increased load capacity.
  • ST255/85R16 – A wider, taller tire often used on gooseneck trailers and heavy equipment haulers.
  • ST285/75R16 – Commonly found on commercial and agricultural trailers, this size provides a broader contact patch for stability.
  • ST215/75R17.5 & ST235/75R17.5 – These 17.5-inch radial trailer tires are designed for super heavy-duty loads, often used on large flatbed and industrial trailers.
  • ST245/70R19.5 – A high-capacity 19.5-inch trailer tire, commonly seen on hotshot trucking trailers and semi-trailer applications.

If you are unsure about the right size for your trailer, Whitley Automotive can help you find the perfect fit.

Radial vs. Bias Trailer Tires – What’s the Difference?

When choosing trailer tires, you will often see two types: radial and bias-ply. Each has its advantages, depending on how you use your trailer.

Radial Trailer Tires

  • Best for highway use and long distances
  • Runs cooler, reducing the risk of blowouts
  • Lasts longer than bias-ply tires
  • Provides better traction and fuel efficiency

Radial trailer tires have steel belts running across the tread, which improves stability and longevity.  If you’re towing construction equipment, large machinery, or heavy-duty cargo, all-steel construction tires should be your go-to choice.

Bias-Ply Trailer Tires

  • Best for off-road, farm, and construction trailers
  • Strong sidewalls for heavy loads
  • More affordable than radial tires

Bias-ply tires are built with crisscrossed nylon layers, giving them extra strength on rough terrain. However, they do not last as long or perform as well at high speeds.

If you drive primarily on highways, go with radial trailer tires. If you are hauling equipment on rough roads or farmland, bias-ply tires might be a better fit.

ST vs. LT Tires – Which One Do You Need?

Many trailer owners wonder whether they can use light truck (LT) tires instead of special trailer (ST) tires. While LT tires may seem like a good alternative, there are key differences that make ST tires the better choice for trailers.

ST tires are specifically designed for heavy trailer loads, featuring thicker sidewalls that provide extra stability and reduce swaying while towing. These reinforced sidewalls help the tire handle the weight of the trailer without excessive flexing, ensuring a safer and smoother ride. ST tires also tend to have a longer lifespan under heavy loads, making them a more durable option for trailer use.

On the other hand, LT tires are built for steering and traction on light trucks and SUVs rather than load-bearing support for trailers. While they may seem like a viable option, their softer sidewalls can lead to excessive flexing under heavy loads, which can cause instability and premature wear. Additionally, LT tires generally do not last as long when used on a trailer.

For stability, safety, and longevity, it is always best to choose ST-rated trailer tires to ensure your trailer performs at its best.

Top Trailer Tire Manufacturers to Consider

Not all trailer tires are created equal. Choosing a reputable manufacturer can mean the difference between a smooth ride and a roadside breakdown.

Best Trailer Tire Brands

  • Goodyear Endurance – One of the best American-made trailer tires with excellent durability.
  • Maxxis M8008 – A premium radial tire known for its long tread life.
  • Carlisle Radial Trail HD – Great for boat and utility trailers, offering balanced performance.
  • Hercules H-901 ST – A heavy-duty option for commercial use.
  • Trailer King RST – A budget-friendly but reliable choice for light trailers.

At Whitley Automotive, we carry top-tier trailer tires and can help you select the best one for your towing needs.

How to Choose the Right Trailer Tires

When shopping for trailer tires, keep these factors in mind:

  • Load Capacity – Check the tire’s load range (C, D, E, or F) to ensure it can handle your trailer’s weight.
  • Speed Rating – Most trailer tires have a 67 mph max speed. If you drive faster, choose a tire with a higher speed rating.
  • Tread Pattern – Consider the terrain. Highway haulers need smooth tread, while farm trailers need deep grooves.
  • Brand Reputation – Stick with trusted manufacturers for safety and reliability.
  • Age of the Tire – Trailer tires age out before they wear out. Replace them every 3-5 years, even if the tread looks fine.

Trailer Tire Maintenance Tips for Long-Lasting Performance

Regular maintenance helps prevent blowouts and costly replacements. Follow these trailer tire maintenance tips:

  • Check Tire Pressure Weekly – Underinflated tires cause heat buildup and wear out faster.
  • Inspect for Cracks & Bulges – Replace any tires showing sidewall damage.
  • Rotate Tires Every 5,000 Miles – Ensures even tread wear.
  • Avoid Overloading – Always follow the tire’s load rating.
  • Store Tires Properly – Keep your trailer off the ground when parked for long periods to prevent flat spots.

Get the Best Trailer Tires at Whitley Automotive

Choosing the right trailer tires is crucial for safety and performance. Whether you need bias-ply tires for farm use or high-speed radials for long hauls, picking the right size and type matters.

At Whitley Automotive, we specialize in trailer tires, alignments, and diagnostics. Our team is trained to help you find the perfect tire for your utility trailer, RV, or commercial hauler.

Need expert advice? Visit us at 210 Locust Ave, Locust, NC 28097 or Call us at (704) 888-3560, you can also book an appointment online at WhitleyAutomotive.com.

Get your trailer ready for the season—schedule your tire service today!