315/70r18 In Inches – Tire Size, Rim Fitment & Best Tires

The 315/70R18 tire has an overall diameter of approximately 34.4 inches, a section width of roughly 12.4 inches, and is designed to be mounted on an 18-inch diameter rim. The equivalent tire size in the high flotation system is 34.4×12.4R18.

315 70r18 In Inches

What does 315/70r18 Tire mean?

Ever looked at the number sequence on a tire and thought it was some sort of secret tire language? Well, it’s not as cryptic as it seems. These numbers are simply shorthand for a wealth of information about the tire. Let’s break it down in a neat table:

Tire NumberIts Explanation
315This is the section width of the tire, in millimeters. It represents the width of the tire from one sidewall to the other.
70This is the aspect ratio of the tire, expressed as a percentage. It represents the height of the tire sidewall as a percentage of the section width. In this case, it means the height is 70% of 315mm.
RThis letter represents the construction of the tire, with ‘R’ meaning it’s a Radial tire, the most common type used in vehicles today.
18This is the wheel diameter, in inches, that the tire is intended to fit. In this case, it’s designed to fit an 18-inch wheel or rim.

What is 315/70r18 Tire in inches?

Now, let’s go beyond the tire code and figure out what 315/70r18 is in inches. As we’re on a journey of tire enlightenment, let’s look at the tire’s dimensions from every angle. Remember, a tire is not just a round piece of rubber but a complex combination of various measurements.

315/70r18 in Inches and Millimeters

Here’s a table that puts the different dimensions of a 315/70r18 tire into perspective, both in inches and millimeters.

Tire Diameter~34.4875
Section Width~12.4315
Rim Height18457.2
Sidewall Height~8.7220.5
Revolutions~585 per mile~364 per kilometer

A Deeper Dive into the 315/70r18 Tire Specifications

Now that we’ve covered the basics of the 315/70r18 tire, let’s dive deeper into its specifications and uncover more intriguing details. Prepare to be amazed as we explore the dimensions that make this tire a true beast on the road.

Tire Width of 315/70r18: Unleashing Power and Stability

Picture this: you’re driving down the highway, and your vehicle feels as stable as a mountain. That’s exactly what the tire width of 315/70r18 brings to the table. With a robust width of approximately 315 millimeters, this tire is built to conquer the road with authority. It provides a wider contact patch, giving you enhanced traction and grip, especially when maneuvering through treacherous terrains or challenging driving conditions. Say goodbye to those slippery situations and hello to a tire that hugs the road like a long-lost lover.

Tire Height of 315/70r18: Raising the Bar, Literally

Want to stand tall and command attention? Well, the tire height of the 315/70r18 will do just that for your vehicle. With a sidewall height of around 70% of the tire width (which translates to approximately 220.5 millimeters), this tire adds a touch of boldness to your ride. It not only elevates your vehicle’s overall stature but also provides that extra bit of cushioning. Imagine gliding over bumps and potholes, feeling like you’re cruising on a magic carpet ride. Okay, maybe not that magical, but you get the idea.

Sidewall Height of 315/70r18: Bridging the Gap Between Style and Function

Ah, the sidewall height, where style meets function in perfect harmony. The 315/70r18 tire boasts a sidewall height of approximately 220.5 millimeters, giving it a robust and muscular look. This height not only adds to the tire’s aesthetics but also contributes to its performance. A taller sidewall means more flexibility, allowing the tire to absorb shocks and bumps more effectively. It’s like having your very own shock absorber, except it doesn’t complain about your taste in music.

Rim Diameter for 315/70r18: Finding the Perfect Match

Now, let’s talk about the rim diameter that complements the 315/70r18 tire like peanut butter complements jelly (or if you’re allergic, like avocado complements toast). The ideal rim diameter for this tire is 18 inches, providing the perfect marriage between tire and wheel. It’s a match made in automotive heaven, ensuring proper fitment and optimal performance. So, when it comes to choosing the right rim for your 315/70r18 tire, remember that size does matter.

Tire Circumference of 315/70r18: Measuring the World of Traction

Are you ready to unravel the mysteries of tire circumference? Brace yourself because we’re about to measure the world of traction with the 315/70r18. Clocking in at approximately 108.0 inches (or 2743.2 millimeters) in circumference, this tire is a force to be reckoned with. A larger circumference means more ground covered with each revolution, resulting in better stability, improved handling, and enhanced overall performance. It’s like your tires are whispering, “Hold on tight, we’re going places!”

What are the Best 315/70r18 Tires?

When it comes to finding the best 315/70r18 tires, the options might seem as plentiful as toppings at a pizza buffet. But fear not, fellow tire seekers, for I have scoured the market to present you with the crème de la crème of off-road rubber. Get ready to take your vehicle’s performance to new heights with these top-notch tire choices.

1. Toyo Tire Open Country M/T Mud-Terrain Tire – 315/70R18LT 127Q

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Description: The Toyo Tire Open Country M/T is a beastly mud-terrain tire that’s designed to conquer the toughest off-road challenges. Its aggressive tread pattern features deep grooves and sturdy sidewalls, providing exceptional traction and durability. This tire is a perfect match for off-road enthusiasts who crave maximum performance in extreme conditions.

Key Features:

  • Aggressive tread design for superior off-road traction
  • Stone ejector technology prevents stone drilling and enhances tire life
  • Cut and chip resistant compound for increased durability
  • Reinforced sidewalls for added strength and protection against impacts


  • Excellent off-road traction and mud-clearing capabilities
  • Durable construction for long-lasting performance
  • Provides a smooth and comfortable ride on both on and off-road surfaces


  • Slightly noisy on paved roads due to the aggressive tread pattern

Final Recommendation: If you’re seeking unrivaled off-road performance and don’t mind a little extra noise on the streets, the Toyo Tire Open Country M/T is an outstanding choice that will take you places where others fear to tread.

2. YOKOHAMA LT315/70R18 127/124Q E/10 GEO MT G003 BW

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Description: The YOKOHAMA GEO MT G003 is a true off-road warrior, delivering exceptional performance on challenging terrains. Its aggressive tread design and advanced construction make it a reliable companion for off-road enthusiasts who demand both durability and versatility.

Key Features:

  • Aggressive sidewall design for enhanced off-road traction and sidewall protection
  • Geo-Shield construction for improved durability and puncture resistance
  • Stone and mud ejectors to maintain grip and prevent debris buildup
  • Multi-pitch tread pattern for reduced road noise


  • Impressive off-road performance with excellent traction in mud, rocks, and dirt
  • Enhanced durability for extended tire life
  • Relatively quiet on paved roads compared to other mud-terrain tires


  • Slightly less aggressive tread design compared to some competitors

Final Recommendation: For those seeking a well-rounded mud-terrain tire that can handle diverse off-road challenges while offering a more comfortable ride on paved surfaces, the YOKOHAMA GEO MT G003 is a reliable choice that strikes a great balance.

3. Cooper Discoverer AT3 XLT All-Season LT275/70R18 125/122S Tire

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Description: The Cooper Discoverer AT3 XLT is an all-season tire designed for drivers who demand versatility without compromising off-road capabilities. This tire combines aggressive looks with durable construction, making it an excellent choice for both highway cruising and off-road adventures.

Key Features:

  • Armor-Tek3 construction for enhanced durability and resistance to cuts and chips
  • Aggressive shoulder design for improved off-road traction
  • Silica-based compound for enhanced wet traction and braking
  • Whisper Grooves for reduced road noise


  • Versatile performance in various conditions, from highway driving to light off-roading
  • Exceptional traction on wet surfaces, providing added safety
  • Durable construction for extended tire life


  • May not offer the same level of extreme off-road capability as dedicated mud-terrain tires

Final Recommendation: If you’re looking for a tire that can handle daily commutes, weekend getaways, and the occasional off-road excursion, the Cooper Discoverer AT3 XLT is a reliable choice that offers a great balance between on-road comfort and off-road performance.

FAQ’s About 315/70r18 Tire

So, you’ve delved into the world of 315/70r18 tires, but some burning questions still linger in your mind. Fear not, dear reader, for I am here to shed light on the mysteries and quench your thirst for knowledge. Let’s dive right into the frequently asked questions about these mighty rubbers.

Q: What vehicles use 315/70r18 Tires?

A: The 315/70r18 tire size is commonly found on a range of vehicles, particularly trucks and SUVs. It’s a popular choice for off-road enthusiasts who seek the perfect balance between size, performance, and aesthetics. You’ll often find this tire size on vehicles like the Ford F-150, Chevrolet Silverado, Jeep Wrangler, and Toyota Tundra, among others. These tires provide the ruggedness and traction needed for off-road adventures while still offering a comfortable ride on paved surfaces.

Q: How many revolutions per mile does a 315/70r18 have?

A: The number of revolutions per mile can vary slightly depending on the specific tire brand and model within the 315/70r18 size. On average, a 315/70r18 tire will have approximately 585 revolutions per mile. However, it’s worth noting that factors such as tire wear, inflation pressure, and driving conditions can affect this value to some extent.

Q: What is the price of a 315/70r18 tire?

A: Ah, the price, a factor that often determines the fate of our tire-shopping adventures. The cost of a 315/70r18 tire can vary depending on several factors, including the tire brand, model, performance characteristics, and even the region in which you reside. On average, you can expect to find these tires ranging from $200 to $400 per tire. It’s always a good idea to shop around, compare prices from different retailers, and consider any ongoing promotions or discounts to get the best deal.

Q: What kind of rim does a 315/70r18 tire fit on?

A: The 315/70r18 tire is designed to fit on an 18-inch rim diameter. It’s crucial to ensure that the rim width and offset are compatible with the tire size to ensure proper fitment and performance. Consult your vehicle’s manual or reach out to a tire professional to determine the appropriate rim specifications for your specific vehicle.

Q: How much air should be in a 315/70r18 tire?

A: The recommended tire pressure for a 315/70r18 tire can vary depending on the vehicle manufacturer’s specifications. It’s essential to consult your vehicle’s manual or the placard located on the driver’s side door jamb for the recommended tire pressure. In general, the typical tire pressure for a 315/70r18 tire ranges from 35 to 45 psi. Remember to check and adjust tire pressure regularly to maintain optimal performance, fuel efficiency, and tire longevity.

Q: What is a 315/70r18 equivalent to?

A: The 315/70r18 tire size is equivalent to several other common tire sizes, including:

  • 35×12.50r18
  • 305/65r18
  • 34×12.50r18
  • 325/60r18

These equivalent sizes share similar overall dimensions, ensuring compatibility with vehicles that can accommodate the 315/70r18 size.

Comparison with Similar Tires: Unveiling the Differences and Similarities

When it comes to tire sizes, it’s important to understand how they stack up against each other. In this section, we’ll compare the 315/70r18 tire with various similar tire sizes to help you make an informed decision.

315/70r18 vs 295/70r18: Exploring the Width Difference

The 315/70r18 tire and the 295/70r18 tire are similar in many ways, but there is one notable difference—width. The 315/70r18 tire has a width of approximately 315mm, while the 295/70r18 tire measures around 295mm in width. This means that the 315/70r18 tire will provide a slightly wider contact patch, offering enhanced stability and traction. However, it’s important to consider the specific vehicle and driving conditions to determine which width is the best fit for your needs.

315/70r18 vs 35×12.50r18: Decoding the Diameter and Aspect Ratio

Here, we compare the 315/70r18 tire with the 35×12.50r18 tire. The primary difference lies in the way these sizes are expressed. The 315/70r18 represents the tire’s width, aspect ratio, and rim diameter, while the 35×12.50r18 represents the overall diameter and width. In terms of size, both tires have a similar overall diameter, making them suitable for vehicles with ample clearance. However, the 35×12.50r18 tire tends to have a wider tread, which can provide enhanced traction in off-road conditions.

315/70r18 vs 305/70r18: Unraveling the Width and Aspect Ratio

The comparison between the 315/70r18 and 305/70r18 tires highlights slight differences in width and aspect ratio. The 315/70r18 tire boasts a wider width of around 315mm, while the 305/70r18 tire measures approximately 305mm. In terms of aspect ratio, both tires share the same ratio of 70%. The wider width of the 315/70r18 tire can offer a larger contact patch, potentially enhancing grip and stability in various driving conditions.

315 Tires vs 35: Understanding the Numeric Differences

When comparing 315 tires and 35 tires, it’s important to note that the numbers represent different aspects. The 315 in 315 tires refers to the tire width in millimeters, while 35 in 35 tires represents the aspect ratio. The aspect ratio signifies the height of the sidewall as a percentage of the tire’s width. Both tire sizes can offer excellent performance, but the specific vehicle and driving preferences should dictate the best choice.

315/70r17 vs 275/70r18: Analyzing Diameter and Rim Fitment

The comparison between the 315/70r17 and 275/70r18 tires showcases differences in diameter and rim fitment. The 315/70r17 tire has a slightly smaller diameter compared to the 315/70r18, making it suitable for vehicles with 17-inch rims. On the other hand, the 275/70r18 tire is designed for 18-inch rims. It’s crucial to ensure proper fitment and compatibility with the vehicle’s specifications when choosing between these two tire sizes.

305 vs 315 Tires: Exploring Width and Performance

When comparing 305 tires and 315 tires, the primary difference lies in width. The 315 tire has a wider width of around 315mm, providing a larger contact patch and potentially enhancing traction. However, the specific driving conditions, vehicle requirements, and personal preferences should dictate the ideal tire width for your needs.

Conclusion: Making the Right Choice

After exploring the ins and outs of the 315/70r18 tire, its equivalents, and similar tire sizes, it’s time to make a recommendation. The 315/70r18 tire proves to be a versatile and capable option, offering a balance of size, performance, and off-road capability. It provides enhanced stability, traction, and durability, making it a popular choice for trucks and SUVs.

However, tire selection ultimately depends on your specific vehicle, driving style, and preferences. Consider factors such as terrain, weather conditions, and desired performance characteristics when making your decision. Additionally, consulting with a tire professional or referring to your vehicle’s manual can provide valuable guidance in choosing the best tire size for your needs.