305/25R23 in inches

305/25R23 — what does it mean?

• 305 stands for tread width in millimeters
• 25 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

How to convert 305 25R23 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, 25% of the 12″ will result in 3″ 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 29″ total tire diameter (or height).

For your convenience, below is a table for 305/25R23 conversion to inches:

Alternatives to a 305/25R23 tire

If you're looking to upsize your 305 25R23 tires, try to stay within 3% deviation of an overall diameter for safety reasons.