145/70R12 in inches

145/70R12 — what does it mean?

• 145 stands for tread width in millimeters
• 70 is an aspect ration between the tread width and the sidewall in percents
• R means that the tire has a radial construction
• 12 is a wheel diameter (or rim) in inches

How to convert 145 70R12 to inches?

First of all, we need to divide 145 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 5.7″. Then, 70% of the 5.7″ will result in 4″ sidewall.

To get the total height or tire diameter, we need to sum the 12″ rim diameter with two of the sidewall heights. It will result in a 20″ total tire diameter (or height).

For your convenience, below is a table for 145/70R12 conversion to inches:

Alternatives to a 145/70R12 tire

If you're looking to upsize your 145 70R12 tires, try to stay within 3% deviation of an overall diameter for safety reasons.