How Wide is a 315 Tire? A Complete Guide to Understanding Tire Size

If you’re a car enthusiast, then you’ve probably heard of the infamous 315 tire. But, for those who don’t tune cars for fun, this tire size can be somewhat of a mystery. Just how wide is the 315 tire? The answer might shock you.

To put it simply, a 315 tire is incredibly wide. We’re talking about a tire that measures 12.4 inches across! This size is typically found on high-performance vehicles, such as sports cars and muscle cars. It’s no wonder that car enthusiasts love this tire; not only does it look sleek, but it also provides excellent handling and grip on the road.

But why is the 315 tire so popular among car enthusiasts? It all comes down to performance. This size offers a larger contact patch, which allows for better traction and grip on the road. It also provides better stability while driving at high speeds. So, if you’re looking to take your car’s performance to the next level, then you might want to consider upgrading to a 315 tire.

Understanding Tire Sizes and Measurements

Tire sizes can be confusing, with all the various numbers and letters on the sidewall of the tire. It’s important to understand what these numbers and letters mean, so you can make an informed decision when purchasing new tires or interpreting information about your current tires.

  • The first number represents the width of the tire in millimeters. For example, in a 315 tire, the width would be 315mm.
  • The second number is the aspect ratio, which is the height of the tire sidewall as a percentage of the width. For example, in a 315/70R17 tire, the aspect ratio would be 70%, meaning the sidewall is 70% of the width of the tire.
  • The letter following the aspect ratio indicates the type of tire. “R” stands for radial, which is the most common type of tire. Some other letters you may see include “B” for bias ply and “D” for diagonal.
  • The number following the tire type letter is the diameter of the wheel in inches.

It’s important to note that tire sizes can vary depending on the make and model of the vehicle. Always check your vehicle’s owner’s manual or the tire placard located on the inside of the driver’s side door for the correct tire size and type recommended for your vehicle.

When it comes to a 315 tire specifically, it’s important to note that this refers to the width of the tire in millimeters. So, a 315mm wide tire would be just over 12 inches wide. However, it’s important to remember that this measurement may not be exact, and can vary depending on the brand and model of the tire.

Introduction to 315 Tires

315 tires are a popular choice for truck and SUV owners who want to upgrade their vehicle’s look and performance. These tires are wider than standard tires, which means they have a bigger contact patch with the road. This provides better traction and handling, especially in wet or snowy conditions. If you’re considering upgrading to 315 tires, here’s what you need to know:

What Does “315” Mean?

  • The first number on a tire’s sidewall represents its width in millimeters. In the case of 315 tires, this number is 315.
  • The second number represents the tire’s aspect ratio, which is the percentage of the tire’s width that makes up its height. For example, a tire with an aspect ratio of 50 would have a height that is 50% of its width. Most 315 tires have an aspect ratio of 70 or 75.
  • The third number represents the tire’s diameter in inches. So a 315/70R17 tire has a width of 315mm, an aspect ratio of 70, and a diameter of 17 inches.

Pros and Cons of 315 Tires

Before you decide to upgrade to 315 tires, it’s important to consider the pros and cons:


  • Improved handling and traction, especially in wet or snowy conditions.
  • Enhanced appearance – wider tires give your truck or SUV a more aggressive and sporty look.
  • Better load capacity – many 315 tires have a higher load rating than standard tires, making them a good choice for towing or hauling heavy loads.


  • Higher cost – 315 tires are more expensive than standard tires.
  • Reduced fuel economy – wider tires have more rolling resistance, which can reduce your vehicle’s gas mileage.
  • Possible fitment issues – not all trucks or SUVs can accommodate 315 tires without modifications like a lift kit or wheel spacers.

Common Brands and Models of 315 Tires

There are many brands and models of 315 tires to choose from. Some of the most popular include:

Brand Model
Michelin Defender LTX M/S
Nitto Terra Grappler G2
Toyo Open Country A/T II Xtreme
BFGoodrich All-Terrain T/A KO2

When choosing a brand and model of 315 tire, it’s important to consider your driving needs and budget. Some 315 tires are designed for off-road use, while others are better suited for highway driving. You should also shop around for the best price, as tire prices can vary widely depending on where you buy them.

315 Tire Width

One of the most important factors to consider when purchasing a new set of tires is the width. The 315 tire width is a popular choice among truck and SUV owners due to its optimal balance of performance and style.

  • The first number in the 315 tire size indicates the width of the tire in millimeters. Therefore, a 315 tire has a width of 315mm, which is roughly 12.4 inches.
  • A wider tire can provide better handling and traction on the road, especially during turns and in wet or slippery conditions.
  • However, it’s important to ensure that the width of the tire is compatible with your vehicle’s wheels and overall size.

When considering a 315 tire width, it’s important to also take into account the aspect ratio and diameter. The aspect ratio is the height of the sidewall as a percentage of the tire’s width, while the diameter is the total size of the tire from one end to the other.

Here is an example of a 315 tire size breakdown:

Tire Size Width Aspect Ratio Diameter
315/70R17 315mm 70% 17 inches

Overall, the 315 tire width can provide drivers with improved performance and a stylish appearance. However, it’s important to ensure that the size is compatible with your vehicle’s specifications and needs.

315 Tire Diameter

The diameter of a tire is an essential factor in selecting the right size for your vehicle. The diameter indicates the overall height of the tire. A 315 tire has a diameter of around 34.6 inches or 879 millimeters. It’s crucial to get the appropriate size to ensure that your speedometer readings and brake systems function correctly. A wrong size tire can cause problems with clearance, speedometer readings, and suspension settings.

What does 315 mean for Tire Diameter?

  • The first number (315) indicates the tire’s nominal section width, which is the width of the tire in millimeters from sidewall to sidewall when measured at the widest point.
  • The second number (75) represents the tire’s aspect ratio, which is the sidewall height of the tire expressed as a percentage of its nominal section width, in this case, the height is 75% of the width.
  • The last number (16) indicates the diameter of the wheel that the tire should fit.

How to Measure 315 Tire Diameter?

One way to measure the overall diameter of a tire is by using a tire size calculator or utilizing the formula. The diameter can be calculated by multiplying the section width by the aspect ratio, dividing it by 100, and adding twice the rim diameter. In the case of a 315 tire size, the calculation would be as follows:

((315 x 75) / 100) + (16 x 25.4 x 2) = 878.3 mm or approximately 34.6 inches

315 Tire Diameter Comparison Chart

Tire Size Diameter
235/65R16 28.1 inches
275/55R20 31.9 inches
315/70R17 34.4 inches
325/60R20 35.6 inches
265/50R20 30.4 inches

As shown in the comparison chart, a 315 tire has a larger diameter than most of the common tire sizes used on SUVs and trucks. Before purchasing a tire, it’s essential to check the manufacturer’s recommended tire size for your vehicle to avoid any issues that may arise from an incorrect size.

The Pros and Cons of Choosing a 315 Tire

If you’re in the market for new tires for your vehicle, you may have come across the number 315. The 315 tire is a popular choice for truck and SUV owners due to its large size and durability. However, before making a decision, it’s important to weigh the pros and cons of choosing a 315 tire.

  • Pros:
  • Increased Traction: The wider tread pattern of a 315 tire gives your vehicle more surface area to grip the road. This provides better traction and improved performance for off-roading or driving in harsh weather conditions.
  • Enhanced Appearance: The larger size of a 315 tire adds a rugged and aggressive look to your vehicle. If you’re looking for a way to make your truck or SUV stand out, the 315 tire is an excellent option.
  • Improved Handling: The wider tire provides a more stable and responsive ride, especially when cornering. This enhances the overall driving experience and improves the handling of your vehicle.
  • Greater Load Capacity: A 315 tire has a higher load capacity compared to smaller tires. This makes it an ideal choice for those who frequently carry heavy loads or tow trailers.


While there are many advantages to choosing a 315 tire, there are a few potential drawbacks to consider as well.

  • Expensive: Due to their larger size and high-quality construction, 315 tires can be more expensive than smaller options. This may not be an issue for those who value quality over cost, but it’s important to factor in the price when making a decision.
  • Decreased Fuel Efficiency: Wider tires typically result in lower gas mileage due to increased rolling resistance. This means you’ll need to fill up more often and spend more money on gas over time.
  • Fitment Issues: Not all vehicles are compatible with a 315 tire size. Before making a purchase, it’s important to check your vehicle’s owner’s manual or consult with a mechanic to ensure proper fitment.

Tire Size Chart

Choosing the right tire size can be a daunting task, especially if you’re unfamiliar with the terminology and specifications. To help simplify the process, we’ve provided a tire size chart for the 315 tire:

Size Overall Diameter (in) Section Width (in) Recommended Rim Width (in) Load Capacity (lbs)
315/70R17 34.4 12.4 8.5-11 3195
315/75R16 34.6 12.5 8-11 3860
315/60R20 35.4 12.5 8.5-11 3970
315/35R20 28.7 12.5 8.5-11 2094

As you can see, there are several variations of the 315 tire size, each with different specifications and recommended rim widths. When choosing a tire, it’s important to select the proper size for your vehicle and driving needs.

Comparing 315 Tires with Other Tire Sizes

When it comes to choosing the right tire size for your vehicle, there are a few factors to consider. One of the most important is the width of the tire. The 315 tire is a popular size for trucks and SUVs, but how does it compare to other sizes? Let’s take a closer look.

  • 285 vs 315 Tires: The 285 tire is slightly narrower than the 315, with a width of 11.22 inches compared to 12.4 inches. This can make a difference in how the tire performs on different terrains. The 315 tire is generally better suited for off-road driving, while the 285 is a good choice for everyday use.
  • 305 vs 315 Tires: The 305 tire is also narrower than the 315, with a width of 12.01 inches. While it is closer in size to the 315, it is not as wide and may not offer the same level of traction in certain situations.
  • 325 vs 315 Tires: The 325 tire is wider than the 315, with a width of 12.8 inches. While this may offer better traction in some situations, it can also make the tire more difficult to maneuver on the road. This is why the 315 tire is often preferred for off-road driving.

As you can see, the 315 tire is a good choice for off-road driving and offers a balance of width and maneuverability. However, depending on your driving needs, other tire sizes may be a better fit.

When choosing a tire size, it’s important to consider factors such as the type of vehicle you have, the driving conditions you will encounter, and your personal preferences. By taking the time to choose the right tire size, you can improve the performance and safety of your vehicle.

Tire Size Width (inches)
285 11.22
305 12.01
315 12.4
325 12.8

Table 1: Comparison of Tire Sizes

Popular Vehicles that Use 315 Tires

With a tire width of 315 millimeters, it is no surprise that these tires are the top choice for heavy-duty vehicles that need extra grip and stability on the road. Here are some of the most popular vehicles that use 315 tires:

  • Dodge Ram 3500 and 4500
  • Ford F-350 and F-450
  • Chevrolet Silverado 3500HD
  • GMC Sierra 3500HD
  • Ram 3500
  • Toyota Tundra
  • Nissan Titan

These vehicles are primarily used for towing, hauling, and off-roading, making the 315 tire a must-have for increased performance and safety. The width of these tires ensures a large contact patch with the road, providing the vehicle with better traction and control.

Aside from these heavy-duty vehicles, 315 tires are also a popular choice for high-performance cars such as the Porsche 911 GT2 and GT3 RS. These sports cars require wider tires for better grip during high-speed driving, making the 315 tire an excellent option for enthusiasts.

Vehicle Tire Size Wheel Size
Dodge Ram 3500 and 4500 LT315/70R17 17 inches
Ford F-350 and F-450 LT315/70R17 17 inches
Chevrolet Silverado 3500HD LT315/70R17 17 inches
GMC Sierra 3500HD LT315/70R17 17 inches
Ram 3500 LT315/70R17 17 inches
Toyota Tundra LT315/70R17 17 inches
Nissan Titan LT315/70R17 17 inches
Porsche 911 GT2 and GT3 RS 315/30R20 20 inches

Overall, the 315 tire has become a popular choice for heavy-duty vehicles and high-performance sports cars due to its wider size and superior traction. Whether you are hauling heavy loads or racing on the track, these tires will provide the necessary grip and stability for a safer and more enjoyable experience.

Tips for Maintaining 315 Tires

When it comes to maintaining your 315 tires, there are several things you can do to extend their lifespan and improve their performance. One of the most important aspects of tire maintenance is checking the tire pressure regularly. This ensures optimal performance, fuel efficiency, and safety on the road. Additionally, you should inspect your tires for any signs of wear and tear, and replace them as soon as necessary.

  • Check tire pressure regularly to ensure optimal performance, fuel efficiency, and safety on the road.
  • Inspect your tires for any signs of wear and tear, such as cuts, punctures, or bulges.
  • Rotate your tires every 5,000 to 7,000 miles to ensure even wear and tear.

Another important aspect of tire maintenance is rotating your tires regularly. This ensures even wear and tear on all four tires, which can extend their lifespan and improve their overall performance. It is recommended that you rotate your tires every 5,000 to 7,000 miles, or as recommended by the tire manufacturer.

If you are looking to get the most out of your 315 tires, it is also important to drive responsibly and avoid aggressive driving. This can cause unnecessary wear and tear on your tires, which can reduce their lifespan and increase the risk of accidents on the road.

Tire Maintenance Checklist
Check tire pressure regularly
Inspect for signs of wear and tear
Rotate tires every 5,000 to 7,000 miles
Drive responsibly and avoid aggressive driving

In conclusion, maintaining your 315 tires is essential for optimal performance, safety, and longevity. By following these tips for tire maintenance, you can ensure that your tires are in top condition and perform at their best for years to come.

How to Choose the Right 315 Tire for Your Vehicle

If you’re looking for a tire upgrade for your vehicle, you might be considering a 315 tire. But what does the number 315 actually mean? And how can you choose the right tire for your vehicle? Let’s take a closer look.

Understanding the Number 315

The number 315 refers to the width of the tire in millimeters. So a 315 tire is 315 millimeters wide from sidewall to sidewall. This is a fairly wide tire and is often used on trucks and SUVs for added stability and off-road capabilities.

Factors to Consider When Choosing a 315 Tire

  • Tire Type: Consider the type of driving you’ll be doing. Are you looking for an all-terrain tire for off-roading? Or a highway tire for daily commuting? Make sure you choose a tire that is appropriate for your intended use.
  • Tire Brand: Choose a reputable tire brand that is known for quality and durability. Some popular tire brands for 315 tires include Goodyear, Michelin, and Nitto.
  • Load Rating: Make sure the tire you choose has an appropriate load rating for your vehicle. The load rating refers to the weight capacity of the tire and can impact safety and performance.
  • Tread Pattern: The tread pattern can impact traction and performance in different driving conditions. Consider the climate and terrain in which you’ll be driving and choose a tread pattern that is appropriate.
  • Price: Of course, price is always a consideration when choosing a tire. Set a budget and compare prices across different tire brands and retailers to find the best value.

Common 315 Tire Sizes

Here are some common 315 tire sizes you might come across:

Tire Size Aspect Ratio Wheel Diameter
315/70R17 70 17 inches
315/75R16 75 16 inches
315/60R20 60 20 inches

Choose the right tire size for your vehicle based on your manufacturer’s recommendations and the specifications of your specific vehicle.

By considering these factors and understanding what the number 315 means, you can choose the right tire for your vehicle and enjoy improved performance and safety on the road or off.

Cost Considerations for 315 Tires

315 tires are among the most expensive tires due to their size and performance capabilities. As such, cost considerations are important for anyone looking to purchase these tires.

  • Brand: The brand of tire you select can greatly impact the cost. Premium brands such as Michelin and Goodyear are typically more expensive than lesser-known brands.
  • Tire Type: The type of tire you select can also impact cost. High-performance tires, such as those used for racing, will be more expensive than all-season tires.
  • Size: As previously mentioned, 315 tires are among the widest tires available. As such, they typically cost more than traditional sizes.

When purchasing 315 tires, it is important to consider the overall cost. While cheaper tires may save you money in the short term, they may wear out faster and need to be replaced sooner, costing you more in the long run.

Additionally, it is important to properly maintain your tires to extend their lifespan and reduce the frequency of replacements. This includes regular rotations, balances, and alignments.

Brand Price Range (per tire)
Michelin $350-$450
Goodyear $300-$400
Pirelli $275-$375
Nitto $250-$350

As you can see from the table, the cost of 315 tires can vary greatly based on the brand. It is important to research and compare different options to find the best tire for your needs and budget.

How Wide is a 315 Tire? Frequently Asked Questions

1. How wide is a 315 tire in inches?

A 315 tire is approximately 12.4 inches wide.

2. What is the aspect ratio for a 315 tire?

The aspect ratio for a 315 tire varies depending on the specific tire model and manufacturer.

3. What is the recommended rim width for a 315 tire?

The recommended rim width for a 315 tire is between 10 and 12 inches.

4. Will a 315 tire fit on my car?

Whether a 315 tire will fit on your car depends on several factors, including your car’s make and model, and the type of tire you want to install. Consult a tire specialist to determine if a 315 tire is right for your vehicle.

5. What is the load capacity of a 315 tire?

The load capacity of a 315 tire varies depending on the specific tire model and manufacturer. Refer to the tire’s specifications for load capacity information.

6. What is the speed rating for a 315 tire?

The speed rating for a 315 tire varies depending on the specific tire model and manufacturer.

7. How does the width of a 315 tire compare to other tire sizes?

A 315 tire is wider than most passenger car tires but narrower than many light truck and SUV tires.

Closing Thoughts

Thanks for taking the time to learn more about how wide a 315 tire is. We hope these FAQs have answered some of your questions. If you have any other tire-related concerns, don’t hesitate to reach out to a tire specialist or stop by a local tire shop. And be sure to visit us again for more informative articles about the world of automotive technology!