![]() Look for tires that offer a combination of fuel efficiency and performance. Tires with low rolling resistance can help you save up to 3% on fuel. Most modern truck tires have low rolling resistance, which means that the engine doesn’t need to provide as much force to keep the truck moving at speed. Drive and steer tires have the biggest impact. In fact, some estimates suggest that tires account for up to 50% of the rig’s fuel efficiency. Semi trailer tires play an important role in fuel efficiency. When shopping for semi truck tires, there are several things that need to be considered: Fuel Efficiency What to Consider When Buying Semi Truck Tires Tire Manufacturer’s Association, the most common semi truck tire sizes include: Here’s a list of the maximum speed ratings for tires:Īccording to the U.S. The tire’s speed rating in the example above is 124 MPH. The higher the number, the greater the load the tire can support. Just as the name suggests, the load index represents how much weight the tire can support. The letter represents the tire’s speed rating. Some tire sizes will also include the load index, which is represented as a two-digit number and a single letter (e.g. Typically, this number is measured in inches. ![]() The last number in the tire size is the wheel rim diameter. Less common types include B, which stands for belted bias, and D, which stands for diagonal bias. In this case, the R stands for radial construction. The letter after the aspect ratio represents the tire type. A higher aspect ratio indicates a taller tire sidewall. The aspect ratio – in this case, 75 – indicates the percentage of the section height divided by width. In our example, the number 295 should clearly indicate that the measurement is in millimeters – 295 inches would be over 24 feet wide! Aspect Ratio – 75 The width of the tire is listed as either inches or millimeters. Let’s take a closer look at each component and what it means: Tire Width – 295 ![]() Seeing the size 295/75R22.5 may look like a bunch of gibberish, but each number and letter represents a different aspect of the tire’s size. The sizing of semi truck tires can be confusing to those who are new to the industry. Understanding Common Semi Truck Tire Sizes However, it’s not uncommon for fleet owners to move their steer and drive tires to the trailer position before retreading. True trailer tires are typically rib tires. Unfortunately, trailer tires are often overlooked by truckers and even maintenance crews. They run over curbs and get scraped along the pavement. More so than most other tires on a big rig, trailer tires take a beating. Trailer tires just go along for the ride, but they still have an important job. Drive tires have a siped or lug-type tread.ĭedicated drive tires will have a more aggressive tread pattern than steer tires. These tires are designed for drive axles, and their purpose is to maximize traction. Drive TiresĪ truck’s drive tires are the real workhorses of an 18-wheeler. Steer tires can be rated for up to 7,000 pounds and may require tire pressure of 120 psi. In fact, they carry the greatest loads on the truck – up to 2,000 additional pounds. There’s no question that steer tires are unique, and they take on a big load. They also have a rib tread design to help with water evacuation. Steer tires must have tough sidewalls to handle tight corners and keep the truck straight. Tire manufacturers build in extra resistance to help account for this. Not surprisingly, they often show signs of wear and tear sooner than other tires. These tires are constantly working against dozens of other tires on the truck, and they all want to move in different directions. Steer tires ensure that your truck is moving in the right direction, but they also provide traction. One of the most important tires on an 18 wheeler. If you’re a new owner operator or fleet owner, it’s important to understand the types of tires available, common sizes and the features to look for when shopping for tires. To get from A to B quickly and efficiently, your tires must be in good shape.ĭue to all the wear and tear they experience, it’s not surprising that semi truck tires need to be maintained and replaced often. When it comes to fleet maintenance, commercial semi truck tires are one of the most important components to focus on.
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