Big Tex Trailer Tire Size(Comprehensive Guide)

Choosing the correct tire size can be confusing due to the variety of trailer models and their specific requirements. In this guide, we’ll break down everything you need to know about Big Tex trailer tire sizes, including how to identify the right size, factors to consider, and tips for maintenance.

Big Tex Trailer Tire Size

How to Find the Right Tire Size for Your Big Tex Trailer: To determine the correct tire size for your Big Tex trailer, start by checking the following sources:

1. Trailer’s VIN Plate or Manual: The vehicle identification number (VIN) plate, typically located on the trailer’s frame, lists the recommended tire size and load rating. The owner’s manual also provides this information, along with axle ratings and weight capacities.
2. Existing Tires: If your trailer still has its original tires, the sidewall will display the tire size in a format like ST205/75R15. Here, “ST” stands for Special Trailer, “205” is the tire’s width in millimeters, “75” is the aspect ratio (sidewall height as a percentage of width), and “R15” indicates a radial tire for a 15-inch rim.
3. Big Tex Website or Dealer: If you’re unsure about your trailer’s specifications, the Big Tex website or a local dealer can provide detailed information based on your trailer’s model number.

Common tire sizes for Big Tex trailers include:

• ST205/75R15: Found on lighter utility and car-hauler trailers with axle ratings around 3,500 lbs.
• ST225/75R15: Used on medium-duty trailers, such as equipment haulers, with axle ratings of 5,200–7,000 lbs.
• ST235/80R16: Common for heavier trailers, like gooseneck or flatbed models, with axle ratings up to 7,000 lbs.
• LT235/85R16: Often used on heavy-duty trailers with higher load capacities.
• ST235/75R17.5: Found on commercial-grade trailers designed for heavy loads, with axle ratings exceeding 10,000 lbs.

Related Boat Trailer Tire Size(Comprehensive Guide)

Always match the tire’s load range (e.g., Load Range C, D, or E) to your trailer’s gross vehicle weight rating (GVWR). For instance, a Load Range E tire can handle higher weights than a Load Range C tire, making it suitable for heavier Big Tex models.

Factors to Consider When Choosing Tires

When selecting tires for your Big Tex trailer, consider these key factors:

• Load Capacity: Ensure the tire’s load rating matches or exceeds your trailer’s GVWR. Overloading tires can lead to blowouts or uneven wear. For example, a single ST205/75R15 Load Range D tire can carry up to 2,150 lbs at 80 psi, suitable for a 3,500-lb axle.
• Speed Rating: Trailer tires often have speed ratings (e.g., 81 mph for some ST tires). Ensure the tires match the speeds you’ll encounter during towing, especially for long highway trips.
• Radial vs. Bias-Ply Tires: Big Tex trailers commonly use radial tires (denoted by “R” in the size, like ST205/75R15) for better heat dissipation and smoother rides. Bias-ply tires (denoted by “D”) are more durable for off-road use but may wear faster on highways.
• Rim Size and Compatibility: The tire size must match the rim diameter. For example, an ST205/75R15 tire fits a 15-inch rim. Verify rim width compatibility, as mismatched rims can cause tire damage.
• Terrain and Usage: Consider where you’ll tow your trailer. For frequent off-road use, such as on construction sites, bias-ply tires may be better. For highway towing, radial tires are typically preferred.

Related Semi Trailer Tire Size(Top 5 Best Picks)

Tips for Maintaining Big Tex Trailer Tires

Proper tire maintenance extends the life of your tires and ensures safe towing. Here are some practical tips:

1. Check Tire Pressure Regularly: Inflate tires to the pressure listed on the sidewall (e.g., 80 psi for Load Range D). Underinflated tires overheat, while overinflated tires wear unevenly. Check pressure before every trip, as trailer tires lose pressure over time.
2. Inspect for Wear and Damage: Look for cracks, cuts, or uneven tread wear. Replace tires every 3–5 years, regardless of tread depth, as trailer tires degrade from UV exposure and inactivity.
3. Rotate Tires: Rotate tires every 5,000–7,000 miles to promote even wear, especially for tandem-axle trailers where weight distribution varies.
4. Balance and Align: Ensure tires are balanced and the trailer’s axles are aligned to prevent vibrations and uneven wear.
5. Store Properly: When not in use, store your Big Tex trailer in a shaded area or use tire covers to protect against UV damage. Elevate the trailer to reduce stress on tires during long-term storage.

Related Trailer Tire Torque Specs(For All Trailer Types)

Why Tire Size Matters for Big Tex Trailers

Tire size isn’t just a number, it directly impacts your trailer’s performance, safety, and towing experience. The wrong tire size can lead to issues like reduced load capacity, poor handling, increased wear, or even tire failure. Big Tex trailers are built for durability, but their tires must match the trailer’s specifications to handle the intended weight and road conditions. Whether you’re hauling equipment, livestock, or vehicles, understanding tire size ensures your trailer operates at its best.

Big Tex trailers come in various models, from lightweight utility trailers to heavy-duty gooseneck trailers, each with specific tire size requirements based on axle ratings, load capacity, and intended use. For example, a smaller utility trailer might use 15-inch tires, while a heavy-duty equipment hauler could require 16- or 17.5-inch tires to support greater weight.

Related What is the Best RV Trailer Tire(Top 5 Picks 2025)

Common Mistakes to Avoid

• Using Passenger Car Tires: Never use “P” (passenger) or “LT” (light truck) tires on trailers unless specified. ST tires are designed for trailer-specific loads and side-to-side stresses.
• Mixing Tire Sizes or Types: Using different tire sizes or mixing radial and bias-ply tires on the same axle can cause instability and uneven wear.
• Ignoring Load Ratings: Always choose tires with a load rating equal to or higher than your trailer’s GVWR. Undersized tires are a safety hazard.

Final words

Choosing the right tire size for your Big Tex trailer is essential for safe and efficient towing. By checking your trailer’s VIN plate, manual, or existing tires, you can identify the correct size, such as ST205/75R15 or ST235/80R16, based on your model and axle rating.

Consider load capacity, speed rating, and terrain when selecting tires, and prioritize regular maintenance to maximize tire life. Whether you’re hauling a small utility load or a heavy equipment payload, the right tires ensure your Big Tex trailer performs reliably.

For specific recommendations, consult your trailer’s documentation or a Big Tex dealer to keep your towing experience smooth and safe.