TireTalk

When you’re hauling heavy loads — whether it’s for work, delivery, or towing — choosing the right tire isn’t just about tread design or traction. The load rating is a critical factor that determines whether your tires can safely carry the weight you’re putting on them.

At TireWarehouse.ca, we want you to understand exactly what those numbers and letters on your tire’s sidewall mean — and how to choose tires that keep you safe, efficient, and protected under heavy loads.

What Is a Load Rating — and Why Does It Matter?

The load index (or load rating) is a numerical code on the tire’s sidewall that specifies the maximum weight a tire can carry when properly inflated.

For example, a Load Index 123 tire can carry up to 1,550 kg (3,417 lbs) per tire at maximum pressure.

Light-truck and commercial tires may also show a Load Range or Ply Rating — indicators of the tire’s internal strength and construction. A higher load range (like E or F) means the tire is built to handle heavier weights and higher air pressures.

Failing to match your tire’s load rating to your vehicle’s actual weight can lead to excessive wear, overheating, poor handling, or even tire failure. Conversely, a properly rated tire ensures stability, safety, and longer lifespan under demanding conditions.

How to Read Load Information on the Sidewall

Take the example LT275/65 R18 10-Ply 123/120Q — a tire available at TireWarehouse.ca:

• LT = Light Truck

• 275/65 R18 = tire width, aspect ratio, and rim diameter

• 10-Ply = strong, reinforced construction suitable for heavier loads

• 123/120 = dual load index (for single or dual wheel setups)

• Q = speed rating

👉 This specific tire is the Toyo M655 Commercial Grade LT275/65R18 10-Ply 123/120Q — a heavy-duty option designed for commercial and towing applications.

To ensure your tires are correctly rated:

1. Check your vehicle’s tire placard (inside the driver’s door) for load and pressure specs.

2. Verify that the load index on your new tires meets or exceeds your vehicle’s requirements.

3. Maintain proper inflation — because the maximum load capacity is only valid at the correct air pressure.

Heavy-Duty Tire Examples from TireWarehouse.ca

1. Toyo Open Country A/T III LT275/65R18 10-Ply 123/120S

Built for strength and versatility, this all-terrain tire balances rugged construction with smooth highway comfort. Its 10-Ply design and Load Index 123/120 make it an excellent choice for trucks that frequently haul equipment, tools, or trailers.

2. Toyo M655 Commercial Grade LT275/65R18 10-Ply 123/120Q

Engineered for commercial vehicles and work trucks, this tire delivers durability, stability, and high load capacity. The Load Range E construction ensures it can handle heavy payloads day after day, making it ideal for fleets and industrial applications.

Both of these tires are available on TireWarehouse.ca and represent reliable, Canadian-trusted options for anyone moving serious weight.

Key Tips for Safe Heavy-Load Tire Use

• Always match or exceed your vehicle’s original load rating.

• Inflate to the recommended pressure — under-inflation dramatically reduces load capacity.

• Check tire pressure regularly, especially before towing or carrying heavy loads.

• Inspect for uneven wear or damage — heavy cargo can accelerate wear patterns.

• Rotate and align tires as part of regular maintenance to extend lifespan.

Final Thoughts

Understanding tire load ratings isn’t just technical — it’s essential for safety, performance, and cost efficiency. Whether you’re towing, delivering, or working on-site, using properly rated tires like the Toyo Open Country A/T III or Toyo M655 Commercial Grade ensures your vehicle can handle the pressure — literally.

At Tire Warehouse, we carry a full range of commercial-grade and light-truck tires that meet the highest standards for load capacity and reliability. Shop online today or talk to one of our tire experts to find the perfect fit for your truck or fleet.