275/55r18 In Inches – Tire Size, Rim Fitment & Best Tires

The 275/55R18 tire has an overall diameter of approximately 29.9 inches, a section width of roughly 10.8 inches, and is designed to be mounted on an 18-inch diameter rim. The equivalent tire size in the high flotation system is 29.9×10.8R18.

275 55r18 In Inches

What does 275/55r18 Tire mean?

Tire sizes are an alphanumeric mishmash that may seem confusing at first glance. However, they provide valuable information about the tire’s dimensions and capabilities. Here’s a simple table to decode the meaning of 275/55r18:

Tire NumberIts Explanation
275This is the tire’s width in millimeters. It is the distance from one sidewall to the other.
55This is the aspect ratio of the tire. It tells us that the height of the tire’s sidewall is 55% of the tire’s width.
RThis indicates the tire’s construction type. “R” stands for radial, which means the layers run radially across the tire.
18This is the wheel diameter in inches that the tire is designed to fit. In this case, the tire is designed for an 18-inch wheel.

What is 275/55r18 Tire in inches?

While the tire’s width is given in millimeters, the wheel diameter is represented in inches. In terms of dimensions, it might be more intuitive for some to convert all these dimensions into inches or millimeters. So, let’s break down the 275/55r18 tire size into both inches and millimeters:

Tire Diameter29.91759.46
Section Width10.83275
Rim Height18457.2
Sidewall Height5.95151.13
Revolutions674 per mile419 per km

A Deeper Dive into the 275/55r18 Tire Specifications

Now that we’ve decoded the mysteries of tire size nomenclature, let’s take a closer look at each measurement and discuss its role in the overall tire specification. Strap on your seatbelts, folks – we’re going on a ride through the magical world of tire geometry!

Tire width of 275/55r18

The width of our 275/55r18 tire, as the number suggests, is a beefy 275 millimeters – or 10.83 inches if you’re feeling particularly imperial. This is measured from one sidewall to the other. What does this mean in practice? Well, a wider tire can mean better traction because of the larger contact patch with the road. If you’re into sportier driving or live in an area where the roads are often wet, this wider tire could be a great choice. It’s like the contact patch is giving the road a big, wide hug. Who doesn’t love a good hug, right?

Tire height of 275/55r18

The tire height, or diameter, of the 275/55r18 tire is roughly 29.91 inches (or a whopping 759.46 mm for the metric-minded among us). This is calculated by adding the height of two sidewalls to the rim height. A larger tire diameter can provide a smoother ride by better absorbing the bumps and potholes we often encounter on the road. Just think of it as your tire acting like a good friend, softening the blows of life’s uneven roads.

Sidewall height of 275/55r18

The sidewall height of the 275/55r18 tire is approximately 5.95 inches, or 151.13 mm. Remember, this measurement is calculated as a percentage of the tire’s width. In this case, the sidewall is 55% of 275 mm. A taller sidewall can absorb more shock from road surfaces, improving ride comfort. But it can also mean less precision in steering. It’s a balancing act, like trying to text while walking – sometimes comfort wins, sometimes precision does!

Rim diameter for 275/55r18

The 275/55r18 tire is designed to fit an 18-inch wheel. The rim diameter is vital as it has to match your vehicle’s wheel diameter. Too large or too small, and you’re looking at some serious fitment issues. It’s like Cinderella’s glass slipper – the perfect fit is everything!

Tire circumference of 275/55r18

Lastly, the tire’s circumference is a round-about 94.01 inches or 2386.82 millimeters. This influences how many times the tire needs to rotate to cover a mile. For our 275/55r18 tire, that’s approximately 674 rotations per mile. This measurement can affect your speedometer reading, so it’s important to keep it in mind when shopping for tires.

What are the Best 275/55r18 Tires?

Selecting the best tire for your vehicle involves weighing multiple factors like driving conditions, performance requirements, and personal preference. Here are our top three picks for the 275/55r18 tire size:

1 – Kumho Ecsta STX Radial Tire – 275/55R18 114V

The Kumho Ecsta STX Radial Tire is a fantastic all-around choice. Designed for light trucks, SUVs, and crossovers, it features a high-tech, silica-infused compound that enhances wet traction and reduces rolling resistance.

Description: The Kumho Ecsta STX offers a symmetrical tread pattern which allows for easy rotation patterns to combat irregular wear. It also has full-depth sipes that help with consistent performance throughout the tire’s life. Plus, the variable pitch tread block design minimizes road noise, making your journey as smooth as butter on a warm day.

Key Features:

  • Silica-infused compound for superior wet performance
  • Symmetrical tread design for uniform wear
  • Full-depth sipes for consistent performance
  • Variable pitch tread blocks for a quiet ride


  • Great all-season performance
  • Excellent wet and dry traction
  • Low road noise
  • Value for money


  • Could be better in heavy snow
  • Tread life could be longer for some drivers

Final Recommendation: The Kumho Ecsta STX Radial Tire is a fantastic all-around tire, especially for drivers who primarily drive in urban or highway conditions. Its performance in wet and dry conditions is excellent. While it’s not the top choice for heavy snow, it still holds its own in mild winter conditions. If you’re seeking a balance of performance, comfort, and affordability, the Kumho Ecsta STX Radial Tire is a worthy contender. Plus, let’s be honest, “Kumho Ecsta STX” just sounds like it means business, doesn’t it?

FAQ’s About 275/55r18 Tire

As we conclude our exciting adventure into the world of 275/55r18 tires, we’d be remiss if we didn’t answer some of the most frequently asked questions about this size. Get your notepads ready; it’s FAQ time!

What vehicles use 275/55r18 Tire?

The 275/55r18 tire size is quite popular and fits a wide range of vehicles. You’ll find this tire size common in SUVs and light trucks. Some of the models include the Ford F-150, Chevy Silverado, GMC Sierra, Dodge Ram, and various models from Land Rover and Range Rover. It’s like the universal blood type of the tire world – it gets along with so many!

How many revolutions per mile does a 275/55r18 have?

A 275/55r18 tire will make approximately 674 revolutions per mile. This is calculated based on the tire’s overall diameter and the universal length of a mile. It’s like the tire’s daily step count – gotta hit that 674!

Price of 275/55r18 inches Tire?

The price for 275/55r18 tires can vary greatly based on the brand, type (e.g., all-season, winter, summer, off-road), and quality of the tire. You can expect to pay anywhere from $120 to $300 per tire. It’s a bit like shopping for shoes – prices vary based on brand, style, and quality.

What kind of rim does a 275/55r18 tire fit on?

As the tire designation suggests, the 275/55r18 tire fits on an 18-inch diameter rim. As for the rim’s width, it typically ranges from 7.5 inches to 9.5 inches. Finding the right rim is like finding the perfect hat for your head – it’s got to be just the right size!

How much air should be in 275/55r18?

The optimal tire pressure for a 275/55r18 tire depends on the vehicle’s weight and the manufacturer’s recommendations. However, a general range is between 30 and 35 PSI (pounds per square inch). Always refer to your vehicle’s owner manual or the tire placard located on the driver’s side door jamb for the correct pressure. It’s like the Goldilocks of tire pressure – it has to be just right!

What is a 275/55r18 equivalent to?

The 275/55r18 tire can be equivalent to various other tire sizes, like 255/60R18 or 285/50R18, depending on the specific vehicle and its tolerances for different tire sizes. These equivalents can offer similar overall diameters but will vary in width and sidewall height. It’s a bit like having a doppelganger in a parallel universe – the same but slightly different!

Comparison with Similar Tires

Tire size comparisons can often feel like a high-stakes game of Sudoku. But fret not, we’re here to demystify some common comparisons in relation to our star player: the 275/55r18 tire.

275/55r18 vs 265/60r18

The 265/60r18 is slightly narrower and taller than the 275/55r18. The first number (265 vs 275) refers to the tire width in millimeters. Thus, the 265/60r18 is 10mm narrower. The second number (60 vs 55) is the aspect ratio, indicating the height of the sidewall as a percentage of the width. This means the 265/60r18 tire has a slightly taller sidewall, which might offer a softer ride but could also result in less precise steering. It’s a bit like choosing between basketball shoes and running shoes – one gives you more stability, the other more agility.

275/55r18 vs 275/65r18

The main difference between the 275/55r18 and the 275/65r18 is the height of the tire. The 275/65r18 is taller due to a larger aspect ratio (65% of 275mm) than the 275/55r18 (55% of 275mm). This could mean a smoother ride but potentially less responsive handling. It’s kind of like choosing between high heels and flats – one gives you more height and potentially a smoother stride, the other provides more control and responsiveness.

Difference between 275/65r18 and 275/70r18

The difference between these two sizes is primarily the tire height. The 275/70r18 has a taller sidewall compared to the 275/65r18, offering a potentially smoother ride but potentially less precise handling. The analogy remains the same here – it’s a trade-off between high heels and flats.

33s vs 275

Comparing a 33-inch tire to a 275 mm wide tire (like our 275/55r18) might seem like comparing apples to oranges. The ’33s’ refers to the diameter of the tire in inches, while ‘275’ refers to the tire width in millimeters. Depending on the aspect ratio and rim size, a 275 tire could potentially be similar in diameter to a 33-inch tire. It’s like comparing a turtleneck to a hoodie based on neck coverage – different clothing items, but potentially similar in one specific aspect.


As we wrap up our deep dive into the 275/55r18 tire, it’s clear that this tire size offers a great balance between comfort and performance. Its wide footprint provides excellent traction and stability, and its moderate sidewall height maintains responsive handling while still offering a comfortable ride. Whether you’re navigating city streets or cruising down the highway, the 275/55r18 tire has got you covered.

Like Goldilocks found the perfect porridge, you too might find the 275/55r18 to be just right for your vehicle. But remember, always double-check your vehicle’s tire specifications before purchasing new tires. Your journey on the road of life deserves the right set of tires, and hopefully, our tire adventure has brought you a step closer to finding yours. So strap in, drive safe, and enjoy the ride!