# FAQ: How Are Tires Measured?

## What does 33s mean on tires?

In our example size, the tire will fit a 18-inch wheel. Some manufacturers build off-road tires using inches instead of millimeters, so you may see sizes like “33×17.” This simply means the total height of the tire is 33 inches and it fits a 17-inch wheel.

## How are tires measured in inches?

The diameter of the rim in inches. A standard sized tire will be displayed in inches. A tire that reads 33 x 12.5 R15, is 33-inches in diameter (or tall), 12.5-inches wide, and will fit a 15-inch wheel. The door jam of your vehicle will also indicate what size tires the manufacturer recommends.

## Are tires measured in diameter or radius?

We know the diameter of the wheel is 15 inches, so the diameter of the tire is given by: tire diameter = wheel diameter + (2 * sidewall height)

## How is tire size determined?

The first number to appear in your tire size information is the width, in millimeters, of the correct tires for your vehicle: P225/70R16 91S. Tire width always refers to the measurement from one sidewall to another. Tire makers calculate the aspect ratio by dividing a tire’s height off the rim by its width.

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## Can you put a 12.50 tire on a 8 inch rim?

You can run 12.5 wide tires on an 8 inch rim.

## What’s the difference between 285 and 265 tires?

The larger 285/70R17 tire in the photo above stands over an inch taller and is nearly an inch wider than the 265/70R17 size. The width of the tread is also a half-inch wider. Many late-model domestic trucks accept this difference in size.

## How tall is a 17 inch tire?

17 INCH TIRES TIRE HEIGHT
225 35 17 23.20
245 35 17 23.75
315 35 17 25.68
335 35 17 26.23

## What size is a 35 inch tire?

The 315/70-17 is called a “35” and is very close to a 35×12. 5×17 in dimensions. Keep in mind that on the Jeep, all of those tires measure around 1″ less than the stated size.

## What size tire is a 32?

Diameter Comparison of Light Truck Tire Sizes

Approx. Tire Diameter (in Inches) P-Metric and European Metric LT-Metric
75-series and 70-series 75-series and 70-series
32 LT265/75R16
31-1/2 265/70R17 LT265/75R16
265/75R16

## Can I use 235 tires instead of 225?

Yesthat size will work 100% perfectly, as it is the exact same diameter as the 225/75-16. 235/70-16 is actually a shorter tire.

## How do you measure tire height?

The sidewall height can be calculated by multiplying the ratio (70 or 0.70) by the width (225): 225 millimeters x 0.70 = 157.5 millimeters. The number 15, or R15, is the diameter of the wheel (or rim) given in inches.

## Are wider tires better?

From a safety point of view, both types have their good sides: On a dry road, wider tires will offer more grip than narrow ones, but the risk of aquaplaning will be higher with wide tires. – In the winter, narrow tires are better under extreme conditions as they provide higher surface pressure against the road.

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## Can I put different size tires on my car?

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 put wider tires on my stock rims?

As a general rule of thumb, it’s safe to fit a tire up to 20 millimeters wider than stock on the original rim. The actual width of the tire will vary depending on the width of the rim: The tire will expand 5 millimeters for every half inch (12.5 millimeters) increase in rim width.