275/70R18 in Inches: Size, Dimensions & All-Terrain Tires

The 275/70R18 tire measures 33.2 inches (843 mm) in overall diameter, 10.8 inches (275 mm) in tread width, and fits an 18-inch (457 mm) wheel. Its sidewall height is 7.6 inches (193 mm), with a circumference of 104.3 inches (2650 mm), giving about 607 revolutions per mile (377 per kilometer).

This size delivers a dependable mix of traction, stability, and ride comfort, making it a strong choice for trucks and SUVs that see both highway use and off-road driving.

Check out more information on Tire Sizes.

What is 275/70R18 in Inches and Metric?

To make it easier to understand the exact size and dimensions of 275/70R18 tires, here’s a detailed table breaking down the measurements in both inches and millimeters:

275/70R18 Full Tire Dimensions

These measurements help determine how the tire fits on a vehicle, its ride comfort, and overall performance. Choosing the right tire ensures better handling, fuel efficiency, and safety for your truck or SUV.

Breaking Down the Meaning of 275/70R18

Understanding tire codes like 275/70R18 is essential to picking the right tire for your driving needs. Here’s what each part of the 275/70R18 marking means:

• 275 (Width): This refers to the tire’s width in millimeters (10.8 inches). A wider tire means better grip and stability, especially useful for off-road driving.
• 70 (Aspect Ratio): This number represents the height of the sidewall as a percentage of the tire’s width. A higher aspect ratio (70%) provides a smoother ride by absorbing shocks on rough roads.
• R (Radial Construction): The R stands for radial tires, which are the most common type today. Radial tires last longer, offer better fuel efficiency, and improve ride comfort compared to older bias-ply tires.
• 18 (Wheel Diameter): This indicates that the tire is designed to fit an 18-inch wheel, which is a standard size for many SUVs and trucks.

By understanding these numbers, you can choose the right tires that match your vehicle’s needs, ensuring a balance between performance, comfort, and durability.

275/70R18 in Inches Conversion Guide

If you ever wondered how to convert tire measurements from metric to inches, you’re not alone! Understanding these conversions helps when choosing replacements or comparing different tire sizes. Let’s break it down step by step.

How to Convert Millimeters to Inches for Width & Height?

The two main measurements you’ll need to convert are the tire width (275 mm) and sidewall height (70% of width). Since 1 inch equals 25.4 mm, use this formula:

• Tire width: 275÷25.4=10.8275 \div 25.4 = 10.8275÷25.4=10.8 inches
• Sidewall height: (275×0.70)÷25.4=7.6(275 \times 0.70) \div 25.4 = 7.6(275×0.70)÷25.4=7.6 inches

Formula for Calculating Overall Tire Diameter

The total tire diameter includes the sidewall height on both sides plus the wheel diameter:

Overall Diameter=(2×Sidewall Height)+Wheel Diameter\text{Overall Diameter} = (2 \times \text{Sidewall Height}) + \text{Wheel Diameter}Overall Diameter=(2×Sidewall Height)+Wheel Diameter (2×7.6)+18=33.2 inches(2 \times 7.6) + 18 = 33.2 \text{ inches}(2×7.6)+18=33.2 inches

So, a 275/70R18 tire has a total diameter of 33.2 inches, which plays a role in ground clearance, speedometer accuracy, and vehicle performance.

275/70R18 in Inches All-Terrain Tires: Performance & Benefits

If you’re someone who loves off-road adventures or frequently drives on rough roads, then all-terrain tires for 275/70R18 are worth considering. These tires are designed to handle various surfaces while still providing a comfortable ride on highways.

How All-Terrain Tires Improve Traction?

All-terrain (A/T) tires come with deeper treads and stronger sidewalls, making them ideal for:
✅ Gravel & Dirt Roads – Prevents slippage and improves stability.
✅Mud & Sand – Self-cleaning tread patterns help maintain traction.
✅ Snow & Ice – Some A/T tires are even rated for winter conditions.

On-Road vs. Off-Road Performance

• On-Road: A/T tires provide a smoother ride compared to mud-terrain (M/T) tires, but they may increase road noise slightly.
• Off-Road: They offer better grip and durability than highway tires, making them perfect for outdoor enthusiasts.
• Fuel Efficiency: A/T tires can slightly reduce fuel economy due to their aggressive tread design, but modern versions are improving efficiency.

Best All-Terrain Tire Brands for 275/70R18

Here are some top-rated A/T tire options in this size:

• BF Goodrich All-Terrain T/A KO2 – Durable and excellent for extreme conditions.
• Goodyear Wrangler DuraTrac – Ideal for both highway and off-road use.
• Michelin Defender LTX M/S – Best for fuel economy and longevity.
• Bridgestone Dueler A/T Revo 3 – Great balance of comfort and off-road capability.

If you need a tire that performs well on and off the road, all-terrain tires are a solid investment!

275/70R18 in Inches Diameter: How It Affects Driving

The tire diameter might not be something you think about every day, but it plays a huge role in how your vehicle performs. Here’s why 33.2 inches in diameter matters for your driving experience.

Why Tire Diameter Impacts Ground Clearance & Fuel Efficiency?

• Bigger tires = more ground clearance – If you drive on uneven or rocky terrain, a larger diameter tire helps prevent scraping and improves off-road capability.
• Larger tires can reduce fuel efficiency – A taller tire means the engine works harder to move the vehicle, leading to slightly higher fuel consumption.

How Diameter Affects Speedometer Accuracy & Vehicle Compatibility

• Speedometer Calibration: If you switch to a bigger tire, your speedometer may read lower than your actual speed.
• Gear Ratio Adjustments: Vehicles tuned for smaller stock tires may need gear ratio changes when upgrading to 33-inch tires.
• Wheel Well Fitment: Always check if your vehicle has enough space for larger tires without rubbing against suspension components.

If you’re considering upgrading tire sizes, be sure to check compatibility with your truck or SUV to maintain optimal performance and safety.

Best 275/70R18 Tire Brands & Models

Picking the right 275/70R18 tires depends on your driving conditions and preferences. Some tires are built for comfort on highways, while others focus on off-road durability. Here are some top-rated 275/70R18 tire options based on performance.

1. Michelin Defender LTX M/S – Best for Highway Comfort

• Designed for smooth highway driving with excellent tread life.
• Low road noise and superior fuel efficiency compared to all-terrain tires.
• Great wet traction, reducing the risk of hydroplaning.

2. Goodyear Wrangler DuraTrac – Best for Off-Road Performance

• Aggressive tread design offers superior traction on mud, snow, and gravel.
• Self-cleaning shoulder blocks help maintain grip in extreme conditions.
• Rated as one of the best all-terrain options for trucks and SUVs.

3. Bridgestone Dueler A/T Revo 3 – Best for City & Off-Road Balance

• A perfect mix of on-road comfort and off-road durability.
• Strong tread compound increases tire lifespan, making it a long-term investment.
• Performs well in rain, light snow, and dirt roads.

4. BF Goodrich All-Terrain T/A KO2 – Best for Extreme Durability & Grip

• Known for its tough sidewalls and long-lasting tread.
• Performs exceptionally well in off-road environments, including rocky terrain.
• One of the most recommended A/T tires for serious adventurers.

Which Tire is Best for You?

• For daily highway driving → Michelin Defender LTX M/S
• For mixed on-road and off-road use → Bridgestone Dueler A/T Revo 3
• For off-road adventures → Goodyear Wrangler DuraTrac or BF Goodrich KO2

How 275/70R18 Tires Compare to Other Sizes?

Wondering how 275/70R18 stacks up against other tire sizes? While it’s a versatile option for SUVs and trucks, some drivers may consider slightly narrower or wider alternatives based on their preferences. Here’s a breakdown of how it compares:

275/70R18 in Inches vs. 275/65R18 – What’s the Difference?

One of the most common comparisons is 275/70R18 vs. 275/65R18, as both are 275 mm wide, but their sidewall height differs.

✅ 275/70R18 has a taller sidewall, making it better for off-road performance and comfort.
✅ 275/65R18 has a shorter sidewall, which improves handling and stability at high speeds.

If you drive on rough terrain, 275/70R18 is the better choice due to the added ground clearance and shock absorption. If you mainly drive on highways, 275/65R18 offers slightly better handling.

Final Thoughts

I’ve learned that tire size plays a huge role in how a vehicle handles, whether on highways, dirt roads, or rocky trails. The 275/70R18 tire is a solid choice because it balances stability, comfort, and off-road capability without compromising daily driving needs. Understanding its width, diameter, and sidewall height helped me see how it affects traction, ground clearance, and fuel efficiency.

Comparing it with other sizes like 265/75R18 or 285/65R18 also made me realize how even small differences can impact performance. Keeping up with maintenance, rotation, and alignment ensures these tires last longer. If you’re thinking about a size change or replacement, knowing the conversion details and safe alternatives can make all the difference for a smoother, safer ride.

For any tire-related issues, consider exploring our Tire Repair services.

FAQs

Q. How wide is a 275/70R18 tire?

A 275/70R18 tire has a width of 10.8 inches (275 mm), providing good stability and traction for trucks and SUVs.

Q. Can I replace 275/70R18 with another size?

Yes, but choose a size within 3% of the original diameter to maintain speedometer accuracy and handling—options like 265/75R18 or 285/65R18 work well.

Q. What are the best all-terrain tires for 275/70R18?

Top picks include the BF Goodrich All-Terrain T/A KO2, Goodyear Wrangler DuraTrac, and Bridgestone Dueler A/T Revo 3 for versatility and off-road grip.