While upgrading or purchasing new tires for SUVs and trucks, it is important to consider tire size with a view of improving driving performance and comfort, besides fuel consumption. When it comes to the tires with 20 inch rims, two commonly used tire sizes are 275/60R20 and 275/55R20. The differences in the features of the tires distinguish them for different driving purposes. In this article, you will learn the advantages and disadvantages of 275/60R20 and 275/55R20 tire sizes, together with factors such as comfort, stability, and fuel consumption that we will focus on.

Before having a deeper look at the tire size details, let’s have an overview of 275/60R20 and 275/55R20 tire specifications.

Tire Size Specifications

The two tire sizes have the same width and same rim size. The only big difference is the aspect ratio. The 275/60R20 has more sidewall height so it is more tall while the 275/55R20 size has shorter sidewall than 275/60R20.

Performance Differences

Ride Comfort

275/60R20

The 275/60R20 has a bigger sidewall that works as a shock absorbent, as the sidewall is supposed to reduce bumps on the road. So, the higher sidewall gives a smoother and more comfortable ride especially when the ground is rough or contains rocky terrains. If one often drives on rugged roads or dusty trails, then this tire size will be less harsh on passengers and vehicles.   

275/55R20

The lesser sidewall height of the tire 275/55R20 provides a firm ride and more responsiveness. However on city roads and highways, this sidewall results to provide a sportier and more connected feel of the road. This is good for those drivers who want a responsive driving experience.

Handling and Stability

275/60R20

The aspect ratio of 60 increases overall comfort of the car but also increases the sidewall flex, which slightly reduces handling ability, particularly during cornering or while driving at high speeds. For normal road conditions, it provides sufficient sturdiness and performance. Drivers who have a priority for the stability of the tire on irregular surfaces, find this tire useful.

275/55R20

The lower aspect ratio improves handling because of the reduced sidewall flex, which in turn leads to better response in cornering and while driving at high speed. Consequently, in highway and city driving, the stability of this tire is significantly better in terms of handling responsiveness. It can be suggested that drivers who pay special attention to steering response and handling of the vehicle might find this tire suitable for use.

Ground Clearance

275/60R20

This tire size has an overall diameter of approximately 33 inches, and provides more ground clearance. The extra clearance that is provided by this feature will prove useful when driving on rough terrains. For those who use their vehicles on off-road conditions such as off-road trails, rough roads or other challenging road conditions, the 275/60R20 comes with a higher sidewall and added protection.

275/55R20

Measuring about 31.9 inches in diameter, this tire size offers slightly less ground clearance, thus ideal for paved surfaces and city roads. It may not be as protective and might not clear the obstacles as well as the 275/60R20.

Fuel Efficiency

275/60R20

The larger diameter and taller sidewalls can also raise the rolling resistance level, which means that the vehicle requires more power to keep the tires rolling, so it slightly reduces fuel economy. Fuel efficiency is reduced if the vehicle uses more time on the highways and city traffic jams as the bigger tires may use a little bit more fuel.

275/55R20

The 275/55R20 has less overall diameter and a profile which directly impacts fuel efficiency, but only slightly. Lower rolling resistance means lower demands on the engine, which makes it an acceptable option for those drivers who are looking to save a few bucks on fuel, primarily driving around the city.

Pros and Cons

Pros of 275/60R20

Enhanced Comfort: These tires have extended sidewalls and thus provide better absorption of shock on rough roads.

Improved Ground Clearance: It has a larger diameter that offers better enhancement when it comes to the ground clearance to prevent cases of damage.

Better Off-Road Performance: They get more sidewall height, which also improves the tire’s adjustability on irregular terrains.

Cons of 275/60R20

Reduced Handling Precision: They may slightly affect stability and response slightly due to the increase in the height of the sidewalls, when driving at high speeds and taking sharp bends.

Increased Rolling Resistance: Its size can impact its fuel efficiency, particularly on urban roads.

Pros of 275/55R20

Responsive Handling: Leeser sidewall height of the tires increase sensitivity to turning instructions, and therefore provides better stability.

Ideal for City Driving: This tire is good for comfort and grip, and works well on city streets.

Better Fuel Efficiency: Due to reduced diameter, minimum rolling resistance can enhance the fuel efficiency.

Cons of 275/55R20

Reduced Comfort on Rough Roads: The short sidewall does not provide a cushion when driving over rough terrains, bumps, and uneven roads.

Lower Ground Clearance: Lower clearance can be considered a disadvantage on off-road surfaces due to restricted off-road performance.

Choosing the Correct Tire

Before choosing a tire, you have to make the following considerations according to your driving needs and budget.

Vehicle Compatibility

Both of these sizes are standard on trucks and SUVs but there are some vehicles which will run better on one size as compared to the other. It is also important to measure the recommended tire size before purchasing the tire as per the manufacturer's standards.

On/Off Road Traction

For both 275/60R20 and 275/55R20, all-season, all-terrain, and mud-terrain tread patterns are available. The choice depends on the type of roads used regularly.

All-Season Tires: Designed for use in the city and on highways.

All-Terrain Tires: Applicable for on road and off road vehicles.

Mud-Terrain Tires: It is suitable for use by off road enthusiasts.

Cost Considerations

Surprisingly, both sizes are easily found in different tire shops and, therefore, the cost may vary depending on the brand and tire model. In general, 275/60R20 may be a bit more expensive in terms of the size difference but differences in prices are usually more dependent on brands of the particular tires.

Final Words

In general, the choice between 275/60R20 and 275/55R20 depends on the type of use. For better comfort, off-road performance potential, and greater ride height, the 275/60R20 are suitable. On the other hand, if you care more about the handling, city performance, and fuel economy aspect, then the 275/55R20 seems to be the ideal tire size. Every size is designed for different driving needs and requirements.