Trailer Tire Load Range Chart A Complete Guide For All

A trailer tire load range chart tells you how much weight each tire can safely carry. Choosing the right load range protects your trailer, your cargo, and everyone on the road. This guide breaks down every letter rating from C to G with clear charts and practical tips.

If you tow anything — a boat, a horse trailer, a utility trailer, or an RV — you need to understand the trailer tire load range chart. It is not just a bunch of letters and numbers. It is the difference between a safe trip and a dangerous breakdown on the highway.

Many trailer owners pick tires based on looks or price. That is a big mistake. The load range printed on the tire sidewall tells you exactly how much weight the tire can handle at the correct pressure. Pick the wrong one, and you risk tire failure, cargo damage, or worse.

This guide walks you through everything you need to know. We will decode every load range letter, show you how to read the chart, and help you choose the right tire for your specific trailer. Whether you are a first-time tower or a seasoned hauler, you will find practical advice here.

Key Takeaways

• Load range letters matter: Each letter (C through G) represents a different weight capacity and ply rating.
• Check your trailer manual: Always match your tire load range to the gross axle weight rating of your trailer.
• Inflation is critical: Proper tire pressure unlocks the full load capacity listed on the sidewall.
• ST tires are best for trailers: Special Trailer tires handle side loads better than standard passenger tires.
• Don’t guess on size: Using the wrong tire size or load range can lead to blowouts and unsafe towing.
• Inspect regularly: Even the right tires need routine checks for wear, cracks, and proper inflation.

What Is a Trailer Tire Load Range Chart?

A trailer tire load range chart is a reference tool that shows the weight capacity of different tire sizes at each load range rating. Think of it as a cheat sheet for tire strength. Each letter — from C to G — tells you how much air pressure the tire needs and how much weight it can carry.

The chart connects three things: tire size, ply rating, and load capacity. The ply rating used to mean the number of fabric layers in the tire. Today, it is more of a strength rating than a literal layer count. But the idea stays the same — higher ply ratings mean stronger tires that can handle more weight.

You will find trailer tire load range charts at tire shops, online retailers, and in owner’s manuals. They are essential tools for anyone who pulls a trailer regularly.

Why the Load Range Letter Matters

Every tire has a letter stamped on the sidewall. That letter is the load range. It tells you the maximum weight the tire can carry at its recommended pressure. Here is a quick look at what each letter means:

• Load Range C: Light-duty trailers. 6-ply equivalent. Lower weight capacity.
• Load Range D: Medium-duty trailers. 8-ply equivalent. Popular for utility and boat trailers.
• Load Range E: Heavy-duty trailers. 10-ply equivalent. Common for RVs and large equipment trailers.
• Load Range F: Extra heavy-duty. 12-ply equivalent. Used for oversized loads and commercial trailers.
• Load Range G: The highest capacity. 14-ply equivalent. Built for the toughest hauling jobs.

As you move up the alphabet, the tire gets stronger and can carry more weight. But it also gets heavier and stiffer. That is why matching the load range to your actual needs is so important.

Understanding Load Range Letters and Ply Ratings

The connection between load range and ply rating confuses many people. Let us clear it up. In the old days, a 6-ply tire had six layers of cotton fabric inside the tire. Today, the materials are stronger, so fewer layers can do the same job. The ply rating now acts as a strength indicator rather than a literal count.

Here is how the standard trailer tire load range chart breaks it down:

• Load Range C: 6-ply equivalent. Max pressure around 50 PSI.
• Load Range D: 8-ply equivalent. Max pressure around 65 PSI.
• Load Range E: 10-ply equivalent. Max pressure around 80 PSI.
• Load Range F: 12-ply equivalent. Max pressure around 95 PSI.
• Load Range G: 14-ply equivalent. Max pressure around 110 PSI.

Notice the pattern? Higher load range means higher max pressure and higher weight capacity. The tire sidewall will list both the load range letter and the max pressure. Always inflate to the max pressure for the rated load capacity.

ST vs. LT Tires for Trailers

Not all tires are built the same. ST tires (Special Trailer tires) are designed specifically for towable trailers. They handle the unique side forces that trailers create on the road. LT tires (Light Truck tires) are built for trucks and SUVs, not trailers.

Here is a quick comparison:

• ST Tires: Built for trailer use. Stiffer sidewalls. Better handling of side loads. Recommended for all towable trailers.
• LT Tires: Built for trucks. More flexible sidewalls. Not ideal for trailers because they do not handle side forces as well.
• Passenger Tires (P-Metric): Never use these on trailers. They are not designed for the heavy loads and side forces of towing.

Always choose ST-rated trailer tires for your towable. This is one of the most important rules in safe towing.

How to Read a Trailer Tire Load Range Chart

Reading a trailer tire load range chart is easier than it looks. The chart lists tire sizes along one side and load range ratings across the top. Where a row and column meet, you find the maximum load capacity in pounds.

For example, let us say you have a 205/75R15 tire in Load Range D. The chart will show you the exact weight that single tire can carry at 65 PSI. Multiply that number by the number of tires on your trailer, and you get your total carrying capacity.

Here are the steps to follow:

1. Find your tire size: Check the sidewall of your current tire or your trailer manual.
2. Find your load range letter: Look for the letter on the sidewall or in the manual.
3. Locate the chart: Use the manufacturer’s chart or a trusted online reference.
4. Find the load capacity: Read across the row for your size and down the column for your load range.
5. Multiply by tire count: If you have four tires, multiply the single-tire capacity by four.

Reading the Sidewall Information

The tire sidewall is your best friend when it comes to load range information. Here is what to look for:

• Tire Size: Something like 205/75R15 or 225/70R15.
• Load Range Letter: C, D, E, F, or G printed on the sidewall.
• Max Load Pressure: The PSI needed to reach full load capacity.
• Max Load Weight: The weight the tire can carry at that pressure.
• DOT Code: Tells you when the tire was manufactured.

Write all of this down before shopping for replacement tires. Having the right information saves time and prevents costly mistakes.

Choosing the Right Load Range for Your Trailer

Picking the correct load range comes down to one thing: matching the tire to the weight you will carry. Too weak, and the tires will fail. Too strong, and you waste money on tires you do not need.

Start by finding your trailer’s gross axle weight rating (GAWR). This number tells you the maximum weight each axle can support. Divide that by the number of tires on the axle, and you know the minimum load capacity each tire needs.

For example, if your trailer has a GAWR of 6,000 pounds and four tires, each tire needs to carry at least 1,500 pounds. Now look at the trailer tire load range chart for your tire size and find the load range that meets or exceeds that number.

Matching Load Range to Trailer Type

Different trailers need different load ranges. Here is a general guide:

• Small Utility Trailers (up to 2,000 lbs): Load Range C or D usually works fine.
• Boat Trailers (2,000 to 5,000 lbs): Load Range D or E is common.
• Horse Trailers (5,000 to 10,000 lbs): Load Range E is the standard choice.
• RVs and Large Equipment Trailers (over 10,000 lbs): Load Range E or F recommended.
• Commercial and Heavy-Duty Trailers: Load Range F or G for the toughest jobs.

These are general guidelines. Always check your trailer’s manual or the sticker on the frame for the exact requirements. When in doubt, go one load range higher for a safety margin.

Quick Tips for Choosing the Right Tire

• Never exceed the trailer’s GAWR, even if the tires can handle more.
• Replace all tires on the same axle at the same time for even wear.
• Buy tires with a higher load range if you regularly haul near-maximum weight.
• Check the tire speed rating — most ST tires are rated for 65 mph, which is fine for towing.
• Consider radial tires for a smoother ride and better heat dissipation compared to bias-ply tires.

Common Mistakes When Selecting Trailer Tires

Even experienced towers make mistakes with trailer tire load range selection. Here are the most common ones to avoid.

Mistake 1: Using Passenger Car Tires

This is the number one mistake. Passenger car tires are not built for the heavy loads and side forces that trailers create. They can overheat, wear out fast, and fail dangerously on the highway. Always use ST-rated tires for trailers.

Mistake 2: Ignoring the Max Pressure Rating

Some owners inflate their tires to a comfortable 35 PSI and call it good. But if the tire needs 80 PSI to reach its rated load capacity, you are carrying far less weight than the tire can handle. Always inflate to the max pressure listed on the sidewall for full load capacity.

Mistake 3: Mixing Load Ranges on the Same Axle

Never mix different load range tires on the same axle. The weaker tire will wear out faster and could fail under load. Always match tires on the same axle for size, load range, and brand if possible.

Mistake 4: Forgetting About Tire Age

Tires degrade over time, even if they have plenty of tread. Look for the DOT code on the sidewall. The last four digits tell you the week and year of manufacture. Replace any trailer tire that is more than five to six years old, regardless of tread depth.

Mistake 5: Guessing the Weight

Do not guess how much your trailer weighs when loaded. Use a public scale or a CAT scale to get an accurate weight. Then compare that to the trailer tire load range chart to make sure your tires can handle it.

Maintaining Your Trailer Tires for Maximum Lifespan

Buying the right trailer tire load range is only half the battle. Proper maintenance keeps your tires safe and extends their life significantly.

Check Pressure Before Every Trip

Tire pressure drops over time, especially in cold weather. Make it a habit to check pressure before every trip. Use a quality tire gauge and inflate to the max pressure listed on the sidewall. Under-inflated tires are the leading cause of trailer tire failure.

Inspect for Damage Regularly

Walk around your trailer before each trip. Look for cuts, bulges, cracks, and uneven wear. Even a small crack can grow into a blowout at highway speeds. Replace any tire that shows visible damage.

Store Tires Properly

If you store your trailer for the off-season, follow these tips:

• Keep tires inflated to the max pressure.
• Store in a cool, dry place away from direct sunlight.
• Place tires on plywood or blocks to prevent flat spots.
• Cover tires with a UV-resistant tire cover.
• If possible, remove the trailer from the tires and store it on jack stands.

Rotate Tires for Even Wear

Trailer tires can develop uneven wear, especially on long trips. Rotate them front to back every 5,000 to 8,000 miles. This promotes even tread wear and helps all tires last longer.

Know When to Replace

Even well-maintained tires wear out. Replace your trailer tires when you see any of these signs:

• Tread depth below 2/32 of an inch.
• Cracks in the sidewall or tread.
• Bulges or blisters on the tire surface.
• Frequent air loss even after sealing leaks.
• The tire is more than six years old, regardless of tread condition.

Replacing tires on schedule is much cheaper than dealing with a roadside blowout. Do not wait until a tire fails to replace it.

Expert Insights on Trailer Tire Load Range

We spoke with several trailer tire specialists to get their top advice. Here is what the experts had to say about trailer tire load range charts and safe towing.

“The biggest error we see is owners buying tires based on what fits the rim, not what the trailer needs,” says Mark D., a tire technician with over 20 years of experience. “Always match the load range to the trailer’s rated weight. A few extra dollars on the right tire pays off in safety and longevity.”

“Pressure is everything,” adds Sarah K., a trailer safety instructor. “I tell every student to check their tire pressure at least once a month, even when not towing. A tire that looks fine can be under-inflated by 20 PSI and lose half its load capacity.”

“Do not ignore the DOT date code,” warns Jake R., a tire shop owner. “I see people driving on 10-year-old tires all the time. Rubber degrades whether you use the tire or not. Five years is the safe maximum. Six is the absolute limit.”

These expert tips reinforce the importance of understanding your trailer tire load range chart and treating your tires with the care they deserve.

Key Takeaways

• Load range letters define strength: Each letter from C to G represents a different weight capacity and ply strength rating.
• Always use ST-rated tires: Special Trailer tires are specifically engineered for the demands of towing.
• Read the sidewall carefully: The tire size, load range letter, max pressure, and max load are all printed there.
• Match the load range to your trailer weight: Use the gross axle weight rating and the chart to find the right fit.
• Inflate to max pressure: This unlocks the full rated load capacity of every tire.
• Maintain and replace on schedule: Regular inspections, proper storage, and timely replacements keep you safe on the road.

The trailer tire load range chart is one of the most important tools in your towing toolkit. Take the time to understand it, and you will enjoy safer trips, better fuel economy, and longer-lasting tires. Do not guess. Use the chart, follow the numbers, and tow with confidence.

Frequently Asked Questions

What does the load range letter on a trailer tire mean?

The load range letter tells you the tire’s strength and maximum weight capacity. Each letter corresponds to a specific ply rating and maximum inflation pressure. Higher letters like E, F, and G indicate stronger tires that can carry heavier loads.

Can I use a higher load range tire than my trailer requires?

Yes, you can go one load range higher for extra safety. However, going too high can make the ride harsher and cost more without real benefit. Match the load range to your trailer’s gross axle weight rating for the best balance of safety and comfort.

How often should I check my trailer tire pressure?

Check your trailer tire pressure at least once a month and before every long trip. Pressure naturally drops over time, and under-inflated tires are the leading cause of trailer tire failure. Always inflate to the maximum pressure listed on the tire sidewall.

What is the difference between bias-ply and radial trailer tires?

Bias-ply tires have internal plies that cross at angles, making them stiffer and more durable for heavy loads. Radial tires have plies that run perpendicular to the direction of travel, offering a smoother ride and better heat dissipation. Radial ST tires are becoming the popular choice for most trailer owners.

How do I know when my trailer tires need to be replaced?

Replace trailer tires when the tread depth falls below 2/32 of an inch, when you see cracks or bulges in the sidewall, or when the tire is more than five to six years old based on the DOT date code. Even tires with good tread can be unsafe after years of age.

Where can I find a trailer tire load range chart?

Most tire manufacturers publish trailer tire load range charts on their websites. You can also find them at tire shops, trailer dealerships, and in your trailer’s owner’s manual. The chart will list tire sizes, load range letters, and the corresponding weight capacities for each combination.

=== CONCLUSION ===

A trailer tire load range chart is not just a reference — it is your roadmap to safe and confident towing. From understanding the letters C through G to matching the right load range to your trailer weight, every detail matters. When you take the time to read the chart, check your pressure, and maintain your tires properly, you protect yourself, your cargo, and everyone sharing the road with you.

Use the tips in this guide every time you buy new trailer tires or plan a trip. Check the load range, match it to your trailer, and never guess again. Safe towing starts with the right tires, and the right tires start with the right chart.