# Often asked: How Do You Measure Tires?

## How do I know what inch my tires are?

How to Determine Tire /Wheel Diameter

1. The First Number. The number 205 represents the section width of the tire, in millimeters.
2. The Second Number. The number 75 refers to the sidewall aspect ratio.
3. The Third Number. The last number, 15 in our example, represents the diameter, in inches, of the wheel on which the tire is mounted.

## What does 33s mean on tires?

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 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.

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## 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 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’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.

## Can I use 215 tires instead of 205?

Nope. The nominal diameter of the 215’s is 1.7% greater than that of the 205’s. The sidewall height is a percentage of the width of the tire, so a 55 series is taller with a wider tire.

## Are 33 tires the same as 285?

YES, 285 wide tires are the same as 33 ” tires although 285 is the tread width in millimeters and 33 ″ is the tire diameter. 285 /75/16 is usually the accepted metric equivalent size for 33’s.

## Which number is tire height?

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.

## How tall is a 315 tire?

P-Metric Tire Sizes – P-Metric to Inches Conversion Chart

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Rim Size P-Metric Size Actual Tire Height
16 Inch 285/75R16 32.8 inches
305/70R16 32.8 inches
315/75R16 34.6 inches
345/75R16 36.4 inches

## How tall is a 225 75r15 tire?

Plus Sizes

235/ 75-15 225 / 75-15
Diameter inches (mm) 28.88 (733.5) 28.29 (718.5)
Width inches (mm) 9.25 (235) 8.86 ( 225 )
Circum. inches (mm) 90.72 (2304.36) 88.87 (2257.23)
Sidewall Height inches (mm) 6.94 (176.25) 6.64 (168.75)

## How much wider is a 235 than a 225 tire?

Plus Sizes

225 /75-15 235 /75-15
Diameter inches (mm) 28.29 (718.5) 28.88 (733.5)
Width inches (mm) 8.86 ( 225 ) 9.25 ( 235 )
Circum. inches (mm) 88.87 (2257.23) 90.72 (2304.36)
Sidewall Height inches (mm) 6.64 (168.75) 6.94 (176.25)

## Can I use 235 55r17 instead of 225 65R17?

Yes. For safety reasons be sure that the replacement tires are rated for both load and speed at or above the specifications for your Vehicle. Be sure to replace the tires in pairs on either the front or rear axles. Failure to do so could cause problems.

## What’s the difference between a 235 tire and a 225 tire?

If considering gas mileage, you’ll want a tire with less rolling resistance. The 225, being thinner, has less rolling resistance than the 235.