When you look at a tire size, you see a bunch of numbers. These are not random numbers but tire size indexes. They tell you about 4 essential factors of tire size.

Thinking of changing your tires into another size? **235 85R16 vs 265 75R16 Tire Size: What’s the Difference?** Can you interchange them? It is essential to know the size of a tire before you purchase one. It will help you to choose the suitable tire size for your vehicle.

This article will help you to interpret tire size index. You will be able to understand the size of a tire properly just by looking at the numbers. It will enable you to understand if 235 85R16 and 265 75R16 tires are interchangeable. To begin with, let’s learn the tire sizes right away.

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## 235/85R16 vs 265/75R16: Find The Difference Considering 4 Aspects

If two tires are similar, or very close in size in respect of Sidewall Height, you can interchange them. It means that you can switch from one size to another without changing all the tires.

Fortunately, the tire size index gives you 4 important aspects about a tire. You can learn the size of a tire just by looking at the tire size index or numbers. A tire size index informs us about Width, Aspect Ratio, Construction Type, and Rim Diameter.

For instance, the tire size index 235 85R16 is fragmented, then we get this 4 information –

- 235 stands for – Tire Width in Millimeters
- 85 stands for – The Aspect Ratio of Height/Width
- R stands for – Construction Type
- 16 stands for – Rim Diameter in Inches

Here we will compare the tire sizes 235 85R16 and 265 75R16 regarding these 4 aspects. It will help you to decide if the two size tires are interchangeable or not.

### Width

The first thing you learn from the tire size index is the Width of a tire. Width is the measurement from one sidewall to another. It determines how wide a tire is. Width is expressed in millimeters.

From the tire size index, the first three digits indicate the Width of a tire. For example, the Width of 235 85R16 is 235 millimeters, which is 9.25 in inches. And the Width of 265 75R16 is 265 millimeters, which is 10.43 in inches.

Evidently, there is a big gap in Width between the two tires. The difference is 10.43 – 9.25 = 1.18 inches. So, the 265 75R16 is wider than the other one by more than one inches.

Now, the question is can you interchange the tires? Well, to get the answer, you need to compare the Aspect Ratio or Sidewall Height of the two tires.

### Aspect Ratio

You can learn the Aspect Ratio of a tire from the numbers. After the Width, the next two digits indicate the Aspect Ratio of a tire. It is measured in percentage.

Now, the Aspect Ratio of 235 85R16 is 85. On the other hand, the Aspect Ratio of 265 75R16 is 75. Aspect Ratio is used to measure the Sidewall Height of a tire.

For instance, as the Aspect Ratio is 85, the Sidewall Height of the 235 85R16 tire will be 85% of its Width. Same is the case for the other one.

To calculate, the Sidewall Height of 235 85R16 is 235 × 85% = 199.75 millimeters, which is 7.86 in inches. On the other hand, the Sidewall Height of 265 75R16 is 265 × 75% = 198.75 millimeters, which is 7.82 in inches.

Evidently, the Sidewall Height of the two tires is almost similar. The difference is only one millimeter, or 0.04 inches. In simple words, these two tires are identical in height.

You can interchange one size with the other. If you choose to use a wider size, you go for the 265 75R16. Otherwise, you can go for the thinner one 235 85R16.

### Construction Type

You can learn the construction type of a tire from the tire size index. A letter is used to express the Construction type of a tire.

Both the tires have the letter ‘R’ in their tire size indexes. It means 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 type tires are ideal for driving on-roads. They provide great gas efficiency. These tires are highly water and damage resistant.

Another well-known construction type is Cross-ply. It is also known as Bias-ply. This type of Construction Type is expressed by the letter ‘B’ in the tire size index. They are better for driving off-roads.

### Rim Diameter

Rim Diameter is an essential aspect to learn about a tire. It is expressed in inches. The last two digits of a tire size index indicate the Rim Diameter of that tire.

Hence, the Rim Diameter of 235 85R16 is 16 inches. Similarly, the Rim Diameter of 265 75R16 is also 16 inches.

The Rim Diameter is a handy piece of information. It tells you if the tire is suitable for the wheel-rim of your vehicle.

In other words, if your vehicle is of 16-inch wheel rim type, you must look for the tire sizes which have 16 inches Rim Diameter. So, both the tires are suitable for your 16-inch wheel rim vehicle.

## Wrapping Up with a Comparison Table between 235/85R16 and 265/75R16:

Aspects | 265 75R16 | 235 85R16 | Difference |

Diameter inches | 31.65 | 31.73 | 0.08 (0.2%) |

Width inches | 10.43 | 9.25 | -1.18 (-11.3%) |

Circumference inches | 99.43 | 99.68 | 0.25 (0.2%) |

Sidewall Height inches | 7.82 | 7.86 | 0.04 (0.5%) |

Revs per mile | 637.23 | 635.65 | -1.58 (-0.2%) |

Aspect Ratio % | 75 | 85 | 10 |

Clearly, the 235 85R16 size tire is thinner than the counterpart. In respect to Sidewall Height, the gap is very very little.

For this reason, these tires are interchangeable. Hence, if you choose to use a thinner one, go for the 235 85R16 size. Otherwise, do the opposite.

## Faqs

### What Size Tire is a 235/85R16 In Inches?

If you know the exact size of a tire, you can decide if the tire is compatible with the vehicle or not. The tire size of 235 85R16 is 235 millimeters in Width, which is 9.25 in inches.The Sidewall Height of the tire is 199.75 millimeters, which is 7.86 inches. This tire is designed to fit a 16-inch wheel rim. In simple words, the tire 235 85R16 is thin and tall in size.

### What Size Tire is a 265/75R16 In Inches?

The tire size of 265 75R16 is 265 millimeters in Width, which is 10.43 in inches.The Sidewall Height of the tire is 198.75 millimeters, which is 7.82 inches. This tire is designed to fit a 16-inch wheel rim.

Evidently, the tire 265 75R16 is wider in size than the former. But the Sidewall Height, which is very crucial to find out interchanging suitability, is very close to the other one. Now, we will compare the size of the two tires regarding 4 factors to find out if they are interchangeable.

## Final Words

Hopefully now you know how to interpret tire size index. You can instantly learn the size of any tire by this method. Compare tires, learn the Width, Aspect Ratio, Construction Type, and Rim Diameter and make yourself competent in choosing the right size tire for your vehicle.

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