Choosing the Right Size OTR Tires for Your Equipment: A Guide to Common Sizes and Factors to Consider


Off-The-Road (OTR) tires are used in a variety of heavy-duty applications, such as mining, construction, and agriculture. They are designed to provide high performance, durability, and stability in challenging terrain and harsh operating conditions. One of the most important factors to consider when selecting OTR tires is the correct size. In this article, we will discuss some common sizes of OTR tires and how to determine the right size for your equipment.

Common Sizes of OTR Tires

OTR tires come in a wide range of sizes and configurations, depending on the application and equipment they are designed for. Some of the most common OTR tire sizes include:

  • 29.5R25
  • 26.5R25
  • 23.5R25
  • 20.5R25
  • 17.5R25
  • 16.00R25
  • 14.00R24
  • 13.00R25
  • 12.00R24

These sizes are often used on large mining trucks, wheel loaders, and other heavy equipment. However, there are many other sizes available, and it’s important to choose the right size for your specific application.

How to Determine the Right Size for Your Equipment

When selecting OTR tires, it’s important to consider the equipment’s weight, load capacity, and operating conditions. Using the wrong size tire can result in reduced performance, decreased stability, and increased risk of damage or failure.

To determine the right size of OTR tire for your equipment, you should follow these steps:

  1. Consult the equipment’s manual or manufacturer’s specifications for recommended tire sizes and load capacities.
  2. Determine the equipment’s gross vehicle weight rating (GVWR) and axle weight ratings. This information can usually be found on the equipment’s data plate or in the manual.
  3. Calculate the tire load capacity required based on the GVWR and axle weight ratings. This can be done using a load capacity chart or calculator provided by the tire manufacturer.
  4. Choose a tire size that can accommodate the required load capacity and fits within the equipment’s specifications.
  5. Consider the operating conditions and terrain where the equipment will be used. Choose a tread pattern and tire construction that is best suited for the terrain and conditions.
  6. Consult with a tire professional or manufacturer if you are unsure about the right size or type of tire for your equipment.

Aside from determining the right tire size, it is also essential to consider other factors that can affect the performance and safety of OTR tires. These factors include tire construction, tread pattern, and inflation pressure.

Tire Construction

OTR tires can be classified as either bias-ply or radial-ply construction. Bias-ply tires have layers of rubber-coated fabric cords that run diagonally across the tire, while radial-ply tires have layers of cords that run perpendicular to the tire’s tread. Radial-ply tires are generally more durable, provide better fuel economy, and offer more comfortable ride quality. Bias-ply tires, on the other hand, are more flexible and offer better traction in soft terrain.

Tread Pattern

The tread pattern of an OTR tire plays a crucial role in providing traction, stability, and wear resistance. Different tread patterns are designed for different terrains and applications. For example, deep, aggressive tread patterns are best suited for loose or muddy terrain, while shallow, smooth patterns are better for hard surfaces. The type of tire construction can also affect the tread pattern’s performance.

Inflation Pressure

Maintaining the correct inflation pressure is essential for the performance, safety, and lifespan of OTR tires. Underinflated tires can cause excessive wear, reduce fuel economy, and increase the risk of blowouts or other tire damage. Overinflated tires can lead to reduced traction, decreased stability, and premature tire failure. It is essential to follow the equipment manufacturer’s recommended tire pressure and to regularly check and adjust the pressure as needed.

In conclusion, selecting the right size of OTR tire is only the first step in ensuring optimal performance and safety. Other factors, such as tire construction, tread pattern, and inflation pressure, must also be considered. By choosing the right tire for your equipment and following proper maintenance practices, you can help maximize the lifespan and performance of your OTR tires.

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