# How do you do a tire conversion?

## How do you do a tire conversion?

The first number on a metric tire is the width in millimeters. Divide this number by 25.4 to get the inch equivalent as there is 25.4 mm in 1 inch. The third number generally preceded by an “R” is the wheel diameter. The sidewall or aspect ratio are used in metric tire sizes to determine the overall height of a tire.

### What tires sizes are interchangeable?

Wheels and tires are not interchangeable words. Tires are a part of the wheel setup. For instance, your vehicle has a set size of rims, but you can buy different sizes of tires to fit those rims, as long as the middle of the tires is the correct size.

#### How do you translate a tire size?

The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire’s width. The bigger the aspect ratio, the bigger the tire’s sidewall will be.

Can you change tire size?

It’s possible to change the size of your tires without actually changing the diameter. Generally, you don’t want to go with tires that have a diameter that is more than 3% different from the factory tires. It’s also a good idea to consult with a trusted mechanic before switching to larger or smaller tires.

Can I Change Tire sizes?

If you ever switch to a different sized tire, you could damage your vehicle. Before switching tire sizes, do some research to ensure that it can be done safely. Most drivers will not need to change their vehicle’s tire size. Stock tire size is what your vehicle was designed to use.

## What tire sizes are interchangeable?

If you have a vehicle with an alphanumeric size, then to find interchangeable sizes in today’s systems, you need to identify your tire’s aspect ratio. If you have a 78-series alphanumeric tire, it should be replaced with today’s 80 or 75-series tires.

### What is the equivalent to 33 inch tires?

285/75/16 is the metric equivalent of a 33″ tire. So….. 16.831″ + 16″ wheel = 32.831″ approximate tire diameter. Although the 285/75/16 is usually the accepted metric size for 33’s, the actual diameter of the tire varies from manufacturer to manufacturer. 285’s actually vary in true diameter.

#### How to read tires specs?

Tire Size Designation. The most important piece of information written on a sidewall is the tire size.

• Service Description. The next piece of information on the tire wall is the service description.
• Department of Transportation (DOT) Code.
• Uniform Tire Quality Grade (UTQG) Standards.
• Final Thoughts.