P225/50R18 in inches

How tall is a P225 50R18 tire?

When converted to inches, the equivalent of a P225/50R18 tire size is 26.8x8.9R18. It means that:

  • height overall (or diameter) is 26.8 inches
  • tread width is 8.9 inches
  • wheel diameter is 18 inches

Learn more

P225/50R18 tire size in inches
P225/50R18 tire size chart

P225/50R18 tire size in inches

P225/50R18 Height / overall diameter: 26.8 inches
Height / overall diameter
26.8 inches
P225/50R18 Tread width: 8.9 inches
Tread width
8.9 inches
P225/50R18 Sidewall: 4.4 inches
Sidewall
4.4 inches
P225/50R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
P225/50R18 Circumference: 84.2 inches
Circumference
84.2 inches
P225/50R18 Revolutions: 753 per mile
Revolutions
753 per mile

P225/50R18 — what does it mean?

  • P means "passenger car"
  • 225 stands for tread width in millimeters
  • 50 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 18 is a wheel diameter (or rim) in inches

P225/50R18 tire code
P225/50R18 tire code

How to convert P225 50R18 to inches?

First of all, we need to divide 225 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 8.9″. Then, 50% of the 8.9″ will result in 4.4″ sidewall.

To get the total height or tire diameter, we need to sum the 18″ rim diameter with two of the sidewall heights. It will result in a 26.8″ total tire diameter (or height).

For your convenience, below is a table for P225/50R18 conversion to inches:

Inches Metric
Overall diameter (height) 26.8″ 681 mm
Tread width 8.9″ 225 mm
Wheel diameter 18″ 681 mm
Sidewall height 4.4″ 113 mm
Circumference 84.2″ 2138 mm
Revolutions 753 / ml 468 / km

Alternatives to a P225/50R18 tire

If you're looking to upsize your P225 50R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
245/45R18 26.6″ -0.18% 9.6″ 18″
235/45R18 26.4″ -0.37% 9.3″ 18″
275/40R18 26.6″ -0.18% 10.8″ 18″
135/80R18 26.6″ -0.18% 5.3″ 18″
145/80R18 27.2″ 0.36% 5.7″ 18″
155/70R18 26.6″ -0.18% 6.1″ 18″
165/70R18 27.2″ 0.36% 6.5″ 18″
185/55R18 26″ -0.78% 7.3″ 18″
205/50R18 26.2″ -0.59% 8.1″ 18″
T185/55R18 26″ -0.78% 7.3″ 18″