P305/40R23 in inches

How tall is a P305 40R23 tire?

When converted to inches, the equivalent of a P305/40R23 tire size is 32.6x12R23. It means that:

  • height overall (or diameter) is 32.6 inches
  • tread width is 12 inches
  • wheel diameter is 23 inches

Learn more

P305/40R23 tire size in inches
P305/40R23 tire size chart

P305/40R23 tire size in inches

P305/40R23 Height / overall diameter: 32.6 inches
Height / overall diameter
32.6 inches
P305/40R23 Tread width: 12 inches
Tread width
12 inches
P305/40R23 Sidewall: 4.8 inches
4.8 inches
P305/40R23 Wheel diameter: 23 inches
Wheel diameter
23 inches
P305/40R23 Circumference: 102.4 inches
102.4 inches
P305/40R23 Revolutions: 620 per mile
620 per mile

P305/40R23 — what does it mean?

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

P305/40R23 tire code
P305/40R23 tire code

How to convert P305 40R23 to inches?

First of all, we need to divide 305 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 12″. Then, 40% of the 12″ will result in 4.8″ sidewall.

To get the total height or tire diameter, we need to sum the 23″ rim diameter with two of the sidewall heights. It will result in a 32.6″ total tire diameter (or height).

For your convenience, below is a table for P305/40R23 conversion to inches:

Inches Metric
Overall diameter (height) 32.6″ 828 mm
Tread width 12″ 305 mm
Wheel diameter 23″ 828 mm
Sidewall height 4.8″ 122 mm
Circumference 102.4″ 2600 mm
Revolutions 620 / ml 385 / km

Alternatives to a P305/40R23 tire

If you're looking to upsize your P305 40R23 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
275/40R23 31.6″ -0.77% 10.8″ 23″
285/40R23 32″ -0.46% 11.2″ 23″
305/40R23 32.6″ 0% 12″ 23″
325/35R23 32″ -0.46% 12.8″ 23″