What’s The Difference Between 275/65r20 and 285/65r20 Tire?

To some people, all tires look the same but there are many differences between each particular tire, not all of them will fit the requirements of your particular vehicle.

Both 275/65r20 and 285/65r20 are amazing tires that will give you a comfortable ride as well as a pleasurable journey.

Like many other people you might wonder what is the difference between 275/65r20 and 285/65r20 size tires. After reading this article we guarantee that you will know all the subtle and major differences between these two tires.

This will help you make an informed choice when choosing any particular tire between 275/65r20 and 285/65r20.

275/65r20 vs 285/65r20 : Whats The Difference?

As the tire size index 4 aspects, we are going to distribute the difference between 275/65R20 and 285/65R20 into 4 parts, which are – width, aspect ratio, construction type, and rim diameter.

Let’s consider tire size 275/65r20 and see what we find from this index – 

  • 275 stands for – Tire width in meters
  • 65 stands for – The aspect ratio of height/width
  • R stands for – Construction type
  • 20 stands for – Rim diameter in inches

Also for 285/65r20 see what we find from this index –

  • 285 stands for – Tire width in meters
  • 65 stands for – The aspect ratio of height/width
  • R stands for – Construction type
  • 20 stands for – Rim diameter in inches

To know more about the tire size index, try reading our article on 275/65R17 vs 285/65R17. Now, let’s jump into the comparison.  

Width

The width of a tire is the first number of the tire size index. To know the width, you have to measure the sidewall of the tire to the opposite one. It is measured in millimeters straight from the tire manufacturers. And the digit in the tire size index representing width is precise.

Considering both 275/65R20 and 285/65R20, the first digits are different. The first digit of one tire is 275 and the first digit of the other one is 285. It means the width of one tire is 275 millimeters while the other one is 285 millimeters wide. Thus, there is a difference of 285 – 275 = 10 millimeters in their width.

Aspect Ratio

When there is this big difference in the width, you may not need to compare other aspects. The aspect ratio is the second digit of the tire size index. It is expressed in percent and you can get it by finding the proportion of the height and width of the tire. Then you need to multiply the proportion by 100. The equation is something like below – 

Aspect Ratio of Tire = Height/Width x 100%  

The second digits of both 275/65R20 and 285/65R20 are 65. Meaning, the heights of both tires are 65% of their widths. Thus, there is no difference in the aspect ratio.  

Construction Type

Judging by both 275/65R20 and 285/65R20 tires, we find the same letter ‘R’. It informs that both tires have Radial Construction. As a result, they are both radial type tires. Usually, such tires have a refined construction with square shaped footprints.

Basically, there are often two letters that can be seen in the tire size index. One is ‘R’, which stands for radial type. And the other one is ‘B’ that represents bias ply type tires. In bias ply tires, the nylon thread lines are angled at 30 to 45 degrees. These have different construction than the radial types.  

Rim Diameter

The very last digit of the tire size index indicates the rim diameter. It is an important aspect of the tire in determining its compatibility. The car’s rim goes into the rim diameter. 

When we compare the last digit of 275/65R20 and 285/65R20, we get the same number 20. As the rim diameter is expressed in inches, both tires have a rim diameter of 20 inches. So, if you are not bothered with the other aspects, you can get any one of these tires for a 20-inch rim.

Summing Up With An In-depth Comparison Table – Tire Size 275/65r20 vs 285/65r20

We have given a detailed comparison chart of 275 65r20 tire and 285 65r20 tire below.

Parameter275 65r20285 65r20Difference
Section width10.8 inch11.2 inch0.4 inch (3.6%)
Overall diameter34.1 inch34.6 inch0.5 inch (1.5%)
Circumference107 inch108.6 inch1.6 inch  (1.5%)
Revs per Mile592583–9 (-1.54%)
Sidewall height7.0 inch7.3 inch0.3 inch  (4.2%)
Aspect Ratio65650 (0%)

From the above comparison chart, we can understand that you can easily switch between 275 65r20 tire and 285 65r20 tire because the change in overall diameter is only 1.5% which is less than 3%. There is also no change in aspect ratio.

So it is safe to say that you can use 275/65r20 tire instead of 285/65r20 tire as well as you can use 285/65r20 tire instead of 75/65r20 tire.

FAQs – Frequently Asked Questions

What Size is 275/65r20 Tire in inches?

When we convert 275/65R20 tire size to inches, it is equal to 34.0×10.8R20. It has a section width of 10.8 inches, a sidewall height of 7.0 inches, a rim diameter of 20 inches, an overall diameter or tire height of 34.0 inches, a circumference of 106.8 inches, making 593 revolutions per mile.

What Size is 285/65r20 Tire in inches?

When we convert 285/65R20 tire size to inches, it is equal to 34.6×11.2R20. It has a section width of 11.2 inches, a sidewall height of 7.3 inches, a rim diameter of 20 inches, an overall diameter or tire height of 34.6 inches, and a circumference of 108.6 inches, making 583 revolutions per mile.

Can you use 275/65r20 tires instead of a 285/65r20 tire?

Ans: Yes you can definitely use 275 65r20 tires instead of a 285 65r20 tire because the change in their diameter size is only 1.5% making them interchangeable.

Can you use 285/65r20 tires instead of a 275/65r20 tire?

Ans: Yes, you can definitely use 285 65r20 tires instead of a 275 65r20 tire because the change in their diameter size is only 1.5% making them interchangeable.

Conclusion

So from the above chart it is clear about the main differences between 285 65r20 tire and 75 65r20 tire. Not only that you also now know the overall diameter, circumference, revs per mile, sidewall height, etc of both these tires.

If you do want to change between these 2 different tires, we recommended that you change all the four tires of your vehicles.

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