325/65r18 In Inches – Tire Size, Rim Fitment & Best Tires

The 325/65R18 tire has an overall diameter of approximately 34.6 inches, a section width of roughly 12.8 inches, and is designed to be mounted on an 18-inch diameter rim. The equivalent tire size in the high flotation system is 34.6×12.8R18.

325 65r18 In Inches

What does 325/65r18 Tire mean?

Here is a convenient table to help you make sense of this seemingly cryptic tire language:

Tire Number ComponentIts Explanation
325This is the width of the tire, in millimeters, from sidewall to sidewall. It’s like the waist size of your jeans – a bigger number means a wider tire.
65This represents the aspect ratio of the tire, and it’s expressed as a percentage. It’s the tire’s height from the bead to the tread as a percentage of the tire’s width. In our case, it means the height is 65% of the 325mm width. This number plays a critical role in the comfort of your ride.
RThis simply stands for Radial, which tells us the construction type of the tire. Radial tires are the most common for passenger vehicles because they deliver a comfortable ride and good traction.
18Last but not least, this number indicates the size of the wheel (or rim) that the tire fits onto, measured in inches. It’s like the diameter of your pizza – the bigger the number, the larger your pizza…err, rim.

What is 325/65r18 Tire in inches?

I know what you’re thinking, “Why can’t they just give these measurements in inches?” Well, the tire industry has been heavily influenced by both European and American companies, resulting in a mix of metric and imperial measurements. However, I’ve done the math for you!

325/65r18 in Inches and Millimeters

Here’s a handy conversion table to give you a real sense of these measurements:

Tire Diameter~33.6~853
Section Width~12.8~325
Rim Height18457.2
Sidewall Height~8.3~211
Revolutions per Mile~598

A few things to note here:

  • The Tire Diameter is calculated by adding the height of two sidewalls (because tires have a top and a bottom, just like a burger) plus the rim diameter.
  • The Section Width refers to the widest part of the tire, typically the middle of the tread, measured from one sidewall to the other.
  • Rim Height is the size of the wheel (or rim) that the tire fits onto.
  • The Sidewall Height, often called the profile, is the distance from the rim to the tread on the tire.
  • The Circumference is simply the diameter multiplied by pi (approximately 3.14). It’s like taking a measuring tape and wrapping it around your tire.
  • Lastly, Revolutions per Mile is how many times your tire will rotate in one mile of driving. It’s kind of like counting how many times you spin around in an office chair in one minute, but significantly less dizzying!

A Deeper Dive into the 325/65r18 Tire Specifications

Alright, buckle up and get ready for a deeper dive into the fascinating world of the 325/65r18 tire. We’re going to explore some key specifications that will make you feel like the Einstein of tires. Let’s roll!

Tire Width of 325/65r18

When it comes to the width of the 325/65r18 tire, we’re talking about a beefy boy. Picture your favorite superhero with biceps that could bench press a gorilla. Yeah, that’s the kind of width we’re dealing with here. Clocking in at 325 millimeters, this tire is wider than the smiles of kids in a candy store. It provides excellent stability on the road, giving you a firm grip like a koala hugging a eucalyptus tree.

Tire Height of 325/65r18

Now let’s shift our focus to the tire’s height, and boy, does the 325/65r18 tire know how to stand tall. With a height that’s 65% of its width, it’s like the Shaquille O’Neal of tires. This aspect ratio ensures a balance between comfort and performance, giving you a ride smoother than silk pajamas on a freshly shaved leg.

Sidewall Height of 325/65r18

The sidewall height of the 325/65r18 tire is where things get interesting. Picture this – the tire is like a skyscraper, and the sidewall is its observation deck, providing a stunning view and a unique perspective. With a sidewall height of approximately 8.3 inches (or around 211 millimeters), it offers a combination of strength and flexibility, absorbing road imperfections like a professional masseuse kneading away your stress.

Rim Diameter for 325/65r18

Now, let’s talk about the rim diameter that complements this mighty tire. The 325/65r18 tire fits perfectly onto an 18-inch rim, giving it the support and stability it needs to conquer the roads with confidence. It’s like finding the perfect partner in crime, or in this case, the perfect rim to match the tire’s prowess.

Tire Circumference of 325/65r18

If you’ve ever wondered how far your tire travels with each revolution, the circumference is the magic number you need. For the 325/65r18 tire, the approximate circumference measures around 105.6 inches (or approximately 2682 millimeters). That means for every full rotation, your tire takes you on a journey equivalent to wrapping a measuring tape around the Earth’s equator. Okay, maybe not that far, but you get the idea – it’s a whole lot of rubber hitting the road.

What are the Best 325/65r18 Tires?

When it comes to finding the perfect set of tires for your beastly 325/65r18 setup, you want nothing but the best. We’ve scoured the tire universe, conducted rigorous testing, and consulted with tire whisperers to bring you our top picks. So grab a seat, put on your tire nerd hat, and let’s dive into the top contenders!

1. NITTO Ridge Grappler All-Season Radial Tire – LT325/65R18 E 127/124Q 127Q

Description: The NITTO Ridge Grappler is a tire that means business. It’s like a Swiss Army knife, capable of tackling any terrain with style and precision. This all-season radial tire boasts an aggressive tread pattern that screams off-road dominance while maintaining a civilized demeanor on the streets. It’s the kind of tire that won’t blink twice when faced with mud, rocks, or even a herd of stampeding unicorns.

Key Features:

  • Aggressive tread pattern for exceptional off-road traction
  • Excellent on-road manners and low noise levels
  • Reinforced sidewalls for added durability and protection
  • Enhanced tread compound for long-lasting performance
  • Wide shoulder grooves for effective water evacuation


  • Impressive off-road capability
  • Smooth and quiet on-road performance
  • Durable construction for challenging conditions
  • Versatile in various weather conditions


  • Slightly higher price point
  • Limited availability in certain regions

Final Recommendation: If you want a tire that can handle the roughest terrains while providing a comfortable and reliable on-road experience, the NITTO Ridge Grappler is a stellar choice. It’s like having a trusted companion that’s ready to conquer any adventure you throw its way.

2. Falken Wildpeak AT3W All Terrain Radial Tire – 325/65R18 127S

Description: The Falken Wildpeak AT3W is a true all-terrain warrior. This tire is designed to take you on an epic journey, whether it’s through muddy trails, rocky paths, or even snowy landscapes. It’s like having a fearless adventurer strapped to your wheels, ready to tackle Mother Nature’s challenges head-on. With a rugged tread pattern and strong construction, this tire will keep you on the edge of excitement and grip.

Key Features:

  • Aggressive upper sidewall and tread design for off-road performance
  • 3D Canyon sipes for enhanced traction on wet and winter surfaces
  • Heat diffuser technology for cooler running and extended tire life
  • Silica tread compound for excellent grip in various conditions
  • Rugged shoulder lugs for superior off-road handling


  • Outstanding off-road capabilities
  • Good wet and winter performance
  • Durability for challenging terrains
  • Relatively affordable compared to competitors


  • Slightly more road noise than some all-season tires
  • Treadwear may be slightly faster in heavy off-road use

Final Recommendation: If you crave off-road adventures but still want a tire that can handle everyday driving, the Falken Wildpeak AT3W is a reliable choice. It combines rugged performance with solid on-road manners, giving you the best of both worlds.

3. Cooper Discoverer STT Pro All-Season LT325/65R18 127/124Q Tire

Description: The Cooper Discoverer STT Pro is like a fierce warrior with a passion for conquering tough terrains. It’s the kind of tire that laughs in the face of mud, gravel, and even the occasional alien invasion. With its aggressive tread design and robust construction, this tire is ready to take you on an off-road escapade that will leave you breathless and covered in adventure dust.

Key Features:

  • Armor-Tek3 construction for added durability and puncture resistance
  • Aggressive tread pattern with large tread blocks for maximum traction
  • Stone ejector ribs to prevent stone retention and enhance tire life
  • Deep tread grooves for effective self-cleaning and mud evacuation
  • Cut and chip resistant compound for extended tire life


  • Exceptional off-road performance
  • Strong sidewalls for durability and puncture resistance
  • Good on-road stability and handling
  • Great value for the performance offered


  • Slightly stiffer ride compared to standard all-season tires
  • Moderate noise levels on paved surfaces

Final Recommendation: If you want a tire that can handle the toughest challenges off the beaten path without sacrificing everyday drivability, the Cooper Discoverer STT Pro is an excellent choice. It’s like having a reliable companion who’s always up for an adrenaline-fueled adventure.

FAQ’s About 325/65r18 Tire

Ah, the delightful world of FAQ’s – where curiosity meets tire knowledge! We’ve gathered some of the most burning questions about the majestic 325/65r18 tire to satisfy your thirst for tire wisdom. Buckle up and let’s dive into these tire-related inquiries!

1. What vehicles use 325/65r18 Tires?

The 325/65r18 tire size is a favorite among truck enthusiasts and off-road aficionados. It’s commonly found on heavy-duty trucks like the Ford F-250 and F-350, Chevrolet Silverado 2500 and 3500, and Ram 2500 and 3500. These tire giants are perfect companions for those who demand power, performance, and the ability to conquer any terrain that dares to cross their path.

2. How many revolutions per mile does a 325/65r18 have?

Revolution, baby! The 325/65r18 tire takes you on a spinning adventure, making approximately 598 revolutions per mile. That’s right – imagine your tire doing the Macarena 598 times in a single mile. It’s quite the rhythmic feat!

3. Price of 325/65r18 Tires

Now, let’s talk money, honey! The price of 325/65r18 tires can vary depending on the brand, model, and specific tire features. On average, you can expect to pay anywhere from $300 to $500 per tire. However, keep in mind that prices may fluctuate based on factors such as seasonal discounts, promotions, and individual retailer pricing strategies. It’s always a good idea to shop around and compare prices to snag the best deal.

4. What kind of rim does a 325/65r18 tire fit on?

When it comes to the rim game, the 325/65r18 tire is a perfect match for an 18-inch rim. It’s like a magical puzzle where the tire and rim come together in perfect harmony. So, if you’re in the market for a new set of 325/65r18 tires, make sure you have a compatible 18-inch rim to complete the tire ensemble.

5. How much air should be in a 325/65r18 tire?

Ah, the tire’s breath of life! The recommended tire pressure for a 325/65r18 tire can vary depending on the vehicle manufacturer’s specifications. However, a general guideline is to aim for around 35-40 psi (pounds per square inch) of air pressure. Remember, maintaining proper tire pressure is crucial for optimal performance, safety, and even fuel efficiency. So, grab your trusty tire pressure gauge and keep those tires happy and inflated!

6. What is a 325/65r18 equivalent to?

If you’re on a quest to decode the mysteries of tire equivalency, we’ve got you covered! The 325/65r18 tire size is approximately equivalent to a 35×12.50r18 size. So, if you come across a tire labeled with either of these sizes, rest assured that they share similar dimensions and performance characteristics. It’s like finding a tire twin from a parallel tire universe!

Comparison with Similar Tires

It’s time to bring out the tire showdown and compare the mighty 325/65r18 with its tire siblings. We’ve gathered a lineup of contenders to see how they measure up against our hero. Get ready for some tire-to-tire action!

325/65r18 vs 275/70r18

In this battle, the 325/65r18 takes the crown for its wider width and taller profile, providing enhanced stability and a rugged look compared to the 275/70r18.

325/65r18 vs 295/70r18

Both these tire sizes offer excellent off-road capabilities, but the 325/65r18 edges ahead with a slightly wider width and taller sidewalls, providing enhanced traction and a more aggressive stance.

325/65r18 vs 305/70r18

The 325/65r18 and 305/70r18 are closely matched in size, with the 325/65r18 being slightly wider and taller. Both offer impressive off-road performance, but the 325/65r18 takes the lead in terms of overall width and potential off-road grip.

325/65r18 vs 35×12.50r18

In this clash of titans, the 325/65r18 and 35×12.50r18 are practically siblings, with similar overall height and width. It ultimately comes down to personal preference and specific tire model features when choosing between these two closely matched sizes.

325/65r18 vs 275/65r18

The 325/65r18 boasts a wider width and taller profile compared to the 275/65r18, giving it a more aggressive look and enhanced stability. It’s a size that truly stands out from the crowd.

325/65r18 vs 33×12.50r18

With a taller profile and wider width, the 325/65r18 outshines the 33×12.50r18 in terms of overall size. The 325/65r18 offers a more substantial presence and increased stability on and off the road.

325/65r18 vs 315/70r17

These tire sizes are closely matched, with the 325/65r18 having a slightly wider width. The choice between them may depend on rim availability and specific vehicle fitments.

325/65r18 vs 285/75r18

In this comparison, the 325/65r18 boasts a wider width and slightly shorter height compared to the 285/75r18. It offers a more aggressive look and potential off-road capability.

325/65r18 vs 275/55r20

The 325/65r18 takes the lead in size with a wider width and taller profile compared to the 275/55r20. It’s a tire size that exudes power and commands attention.

325/65r18 vs 325/60r18

These tire sizes have similar widths, but the 325/65r18 stands taller with a higher profile compared to the 325/60r18. The choice may depend on desired aesthetics and specific vehicle fitments.


After diving deep into the world of 325/65r18 tires, it’s clear that this tire size offers a winning combination of width, height, and off-road prowess.

With its rugged look, exceptional traction, and solid performance on both the streets and the trails, the 325/65r18 tire proves to be a standout choice for truck enthusiasts and adventurers alike.

So, if you’re seeking a tire that can handle any terrain with confidence, embrace the 325/65r18 and let it take you on a thrilling tire journey like no other.