# Question: What Does The Second Number On A Tire Mean?

## What do the numbers on tires mean?

Each group of numbers represents one dimension.

The breakdown is as follows.

The “235” grouping indicates the width of the tire from sidewall to sidewall in millimeters.

The final number group, the “18,” is the size of wheel the tire fits.

In our example size, the tire will fit a 18-inch wheel..

## What does the 265 70r17 mean?

265. This number indicates that your tire has a width of 265 millimeters. 70. This number means that your tire has an aspect ratio of 70%. In other words, your tire’s sidewall height (from the edge of the rim to the tire’s tread) is 70% of the width.

## What happens when you have 2 different size tires on your car?

If you continually use mismatched tires and wheels they will wear out unevenly and can cause problems later down the road. If you choose to drive your vehicle with mismatched wheels the same issues can result. Mismatched wheels will fit each tire differently causing uneven wear and tear.

## What are the 3 numbers on tires mean?

B: TIRE WIDTH The three-digit number following the letter is the tire’s width (from side to side, looking at the tire head on) in millimeters. … In other words, it’s sidewall height divided by tire width. In this example, the aspect ratio is 65, meaning the sidewall is 65 percent as high as the tire is wide.

## Which tire is taller 225 or 235?

If I recall, on a 225/45 tire, the highth is 45% of the tire width. So on a 235 tire, it would be a little taller.

## Can wrong size tires damage transmission?

Increasing Tire Size Will Reduce Your Vehicle’s Effective Gear Ratio. The increased size causes the tires to rotate slower to cover the same amount of ground. … If you are running an automotive transmission this can cause some serious strain depending on the current gear ratio if you choose not to regear your system.

## Can I use 235 tires instead of 225?

Obviously, you will need a certain kind of tire depending on how you use your vehicle. Due to this, a 235 tire might not be better than a 225 tire, or vice versa, but depending on your situation, one tire might serve you better than the other.

## Can I use 225 65r17 instead of 235 60r17?

Both fit 17 inch rims, so one obstacle is out of the way. 235/65R17 has a sidewall height of 153 millimeters (65% of 235 mm), while 225/60R17 has a sidewall height of 135 mm (60% of 225 mm). … You are reducing sidewall height by 18 mm (about 3/4″), so your car will be lower by this amount.

## Can I use 235 65r17 instead of 225 65r17?

You could, and the 225/65R17 tire will fit your existing rims, but you don’t want to do so. The lesser 225mm width tire offer a narrower tread contact patch, as well as potentially a lesser load carrying capability, depending on model of tire.

## Do tire sizes have to match exactly?

They have to meet size standards for bead shape, diameter and width. The U.S. Tire and Rim Association and the European Tire and Rim Technical Organization also agree on other parameters of the tires. These standards, set by these organizations, are usually interchangeable.

## How much difference in tire size is acceptable?

Generally, it is recommended to not exceed a 3% difference when changing from the OEM size on a non-modified vehicle. A green row means that the alternate tire diameter matches the calculated tire diameter.