375/55R20 in inches

375/55R20 — what does it mean?

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

How to convert 375 55R20 to inches?

First of all, we need to divide 375 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 14.8″. Then, 55% of the 14.8″ will result in 8.1″ sidewall.

To get the total height or tire diameter, we need to sum the 20″ rim diameter with two of the sidewall heights. It will result in a 36.2″ total tire diameter (or height).

For your convenience, below is a table for 375/55R20 conversion to inches:

Alternatives to a 375/55R20 tire

If you're looking to upsize your 375 55R20 tires, try to stay within 3% deviation of an overall diameter for safety reasons.