265/70R17 vs 275/70R17 Tire: What’s the Difference?

The tire sizes are easy to understand but become very intriguing while making a change. It happens because it depends upon different factors that also alter the vehicle’s performance on the road.

These factors can be aesthetics, performance, legalization, etc. You may find 265/70R17 and 275/70R17 tires look very similar. But before making a purchase, you should understand if they are interchangeable or not.

The comparison between 265/70R17 vs 275/70R17 Tires will make it easy for you to decide about swapping the tires. Therefore go through this article completely.

265/70R17 vs 275/70R17 Tire: Comparison Table

The aspect ratio being the same, there are not many differences seen while shifting the section width of the tires by 10mm.

265/70R17 TireType275/70R17 Tire
31.61 inches or (802.8)mmDiameter difference: 0.55 (14) 1.7% inches (mm)32.16 inches or (816.8)mm
10.43 inches (265) mm Width difference 0.39 (10) 3.8% inches (mm)10.83 inches (275)mm
99.29 inches or (2522.07)mmCircumference difference: 1.73 (43.98) 1.7% inches (mm)101.03 inches or (2566.05)mm
7.3 inches or (185.5)mmSidewall Height difference 0.28 (7) 3.8% inches (mm)7.58 inches (192.5)mm
638.1 RPM  (396.5)kmRevolutions per mile difference -10.94 (-6.8) -1.7% (km)627.17RPM (389.7)km

For the diameter, you can see that it has only increased by 1.7%. According to the professionals, the limiting range should be 3%. This makes the tires interchangeable.

We can also see a width increment of 3.8%, this negligible change in the width does not impact the vehicle’s performance much. 

Instead, the increased width of the vehicle causes more stability, grip, and traction control on the road. You may also see a better performance while cornering in the sharp turns.

Along with the diameter of the wheel, an increment of 1.7% in the circumference is also observed. This results in lower RPM (1.7% lowered) for covering a mile. As a result, your vehicle will gain more speed than shown in the speedometer.

Considering a highway speed limit is 60mph, you will gain only one mph speed over the manageable limit.

How to read the tire sizes 265/70r17 and 275/70r17?

There are four parts to the tire size 265/70r17, and each part bears a certain meaning. Before you decide to interchange or replace the Tire, you must learn about them. Here is the explanation of each part of the tire size 265/70r17.

  • 265 indicates the width of the tires in millimeters
  • 70 shows the percentage of height to the width or the Aspect Ratio
  • R indicates Radial Construction
  • 17 indicates the Diameter of the Rim

Doing the Same for Tire Sizes 275/70r17

  • 275 means the width of the tires in millimeters
  • 70 shows the percentage of height to the width or the Aspect Ratio
  • R indicates Radial Construction
  • 17 indicates the Diameter of the Rim

What’s The Difference Between 265/70r17 and 275/70r17 Tire?

By now you’ve learned the basics of using two tires interchangeably, now let’s see implementing the theory in a real example. Below, we have compared 265/70r17 and 275/70r17 tires in terms of width, aspect ratio, construction materials, and rim diameter. 

Width

If you measure from one sidewall to the other sidewall of a tire, you will get the width. It is expressed in millimeters. You can instantly learn the Width of a tire just by looking at the tire size index.

The first three digits of a tire size index indicate the Width of that tire. As you can see, the first three digits of 265/70r17 are 265. It means the width of that tire is 265 millimeters.

Likewise, the three-digit number of 275/70r17 is 275. It means the Width of that tire is 275 millimeters. So the difference in the Width is 275 – 265 = 10 millimeters.

Now, if you switch to the tire size which is 0 millimeters more or less in Width, it shouldn’t be a problem. 

But you cannot switch tire size depending on Width only. You must consider the Sidewall Height as well. The Sidewall Height depends on Width and Aspect Ratio.

Aspect Ratio

As you can see, there is no difference between the Aspect Ratio of the two tire sizes. Both tires have an Aspect Ratio of 70%. 

But it doesn’t mean that the sidewall height of the two tires will be similar. Due to the difference in Width, the sidewall heights will be dissimilar.

Let’s start with the simple question first: what is the Aspect Ratio? And its relation with other measurements.

Aspect Ratio is the ratio of the sidewall from wheel to tread and the width. This measurement is usually represented in a percentage.

In our example, 265/70r17 Tire size has a width of 265 with an aspect ratio of 70%. So the sidewall height will be 265 x 0.70 or 7.3 inches or 185.5 mm. You can get the number by simply putting the value on the equation.

Equation: Height of a Sidewall = Aspect Ratio of Tire x Width.

On the other hand, the Sidewall Height of 275/70r17 is 7.6 inches.

As you can see, the sidewall heights of the two tires are very close and they could be interchangeable.

Check out the comparison table down below to learn the exact data and make your decision.

Construction Type

The tire size index informs you about the Construction Type of a tire. It is expressed by a letter in the tire size index. 

Both 265/70r17 and 275/70r17 have the same letter ‘R’. So, both the tires have Radial Construction in terms of construction type.

Such tires have a sophisticated construction with square footprints on the top. The Radial tires are ideal for driving on-road. 

They are resistant to heat and water. They are next-gen tires and can provide great fuel efficiency.  

Another famous construction type is Bias Ply. They are also known as Cross-ply. It is expressed by the letter ‘B’ in a tire size index. This type is great for driving off-road.

Rim Diameter

To know which tire size fits your vehicle, you must know the wheel rim size of your vehicle as well as the Rim Diameter of a tire.

For instance, if your vehicle has a 16-inch wheel rim, you can use the tire which has a 16-inch Rim Diameter.

By looking at a tire size index, you can learn instantly the Rim Diameter of a tire. The last two digits of a tire size index indicate the Rim Diameter. It is measured in inches. 

As you can see, the Rim Diameter of 265/70r17 is 17 inches. Similarly, the Rim Diameter of 275/70r17 is 17 inches.

It means that if your vehicle has a 17-inch wheel rim, you can use both tire sizes. But make sure to use the same size tires for all the wheels.

Can You Interchange Between 265/70R17 vs 275/70R17 Tire?

Yes. These pairs of tires are interchangeable. The diameter of the wheel and width both gets an increment within the accepted limit.

You may also get efficiency in fuel usage while traveling long-distance after interchanging the tires. Because, after interchanging the tires a unit distance can be covered with less RPM.

Speedometer Difference: Using the current Tire Size 265/70r17 Instead Of the New Tire Size 275/70r17

Look at the Table. It shows differences in speedometer reading and the actual speed at any given time when the current Tire Size is 265/70r17 instead of 275/70r17.

Speedo ReadingActual Speed
20 mph (32.19 km/h)20.35 mph (32.75 km/h)
25 mph (40.23 km/h)25.44 mph (40.94 km/h)
30 mph (48.28 km/h)30.52 mph (49.12 km/h)
35 mph (56.33 km/h)35.61 mph (57.31 km/h)
40 mph (64.37 km/h)40.7 mph (65.5 km/h)
45 mph (72.42 km/h)45.78 mph (73.68 km/h)

Speedometer Difference: Using current Tire Size 275/70r17 Instead Of New Tire Size 265/70r17

The table shows the differences in speedometer reading and the actual speed at any given time when the current Tire Size is 275/70r17 instead of 265/70r17.

Speedo ReadingActual Speed
20 mph (32.19 km/h)19.66 mph (31.64 km/h)
25 mph (40.23 km/h)24.57 mph (39.54 km/h)
30 mph (48.28 km/h)29.49 mph (47.45 km/h)
35 mph (56.33 km/h)34.4 mph (55.36 km/h)
40 mph (64.37 km/h)39.31 mph (63.27 km/h)
45 mph (72.42 km/h)44.23 mph (71.18 km/h)

What you must consider Before Interchange or Replace Tire? 

There are important things to consider before replacing or swiping the Tires. You cannot simply replace the 265/70r17 tire with the 275/70r17 tire that is in a different shape.

For example, if the aspect ratio of the existing tire is 40%, replacing it with a tire that has an aspect ratio of  45% might not be a good option.

Doing so will have various consequences on the car’s overall performance, such as variations in top speed and speedometer.

However, to a certain extent, such as minor changes in the diameter or the sidewall, you can switch Tires. However, this can only be done in compliance with the manufacturers’ recommendations.

Anyway, when replacing the Tire, the simple guideline to follow is that the current tire’s size, load index, and speed rating should all match with the replacement Tire.

Load Index and Speed Index of a Tire 265/70r17 and 275/70r17

The load index refers to the maximum load-bearing capacity, whereas the speed index refers to the Tire’s maximum allowable speed at a full load. These are very crucial stats to know before you decide to interchange tires.

Index information can be found on the sidewall right after the Tire size number. It is a combination of numbers and letters that bear a particular meaning. 

Here is an example of how the index information is usually written on the sidewall: 265/70r17 90A. The 90A stands for load and speed index, with 90 indicating a maximum load-bearing capacity of 600 kg, whereas ‘A’ denotes an allowed speed of up to 170 km/h.

Check the load and speed index. They must be as close as possible to fit precisely. These values change depending on the vehicle’s weight and wheel size. Here is a table that shows various load and speed indexes, so you get the idea.

Load IndexKgSpeed IndexSpeed Limit
65290QUp to 160 Km/h
66300RUp to 170 Km/h
67307SUp to 180 Km/h
68315TUp to 190 Km/h
69325HUp to 210 Km/h

Size of the Tire 

The size of the Tire is another vital piece of information to exchange the tires properly. The large number on the sidewall shows the tire size.

For example, the marking 265/70r17 on the sidewall represents the size of the Tire. You can also find it in the user manual, on the sidewall, and in other places such as inside the fuel flap or glove compartment.

What Size Tires Is 265/70r17 in Inches?

265/70r17 tires have a 31.6″ diameter, 10.4″ section width, and 17″ wheel diameter.

The circumference is 99.2″ and they make 638 revolutions per mile. The Sidewall Height of this Tire is 7.3 inches.

What Size Tires Is 275/70r17 in Inches?

275/70r17 tires have a diameter of 32.2″, a section width of 10.8″, and a wheel diameter of 17″. 

The circumference is 101.0″ and they have 627 revolutions per mile. The Sidewall Height of this Tire is 7.6 inches.

Conclusion

Changing tires from 265/70R17 to 275/70R17 gives you a better performance on-road and also a slightly better fuel economy. Though your top speed may get slower due to the increased section width of the tires.

Besides, there is no question about the legalization and troubles from the transport laws. Now that all the facts are updated, you can make a wise decision about interchanging the tires between 265/70R17 and 275/70R17.

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