345/55R15 In Inches – Tire Size & Rim Fitment Guide

What size tire is 345/55R15 in Inches?

The 345/55R15 tire has an overall diameter of 29.9 inches, a section width of 13.6 inches, and can be mounted on 15 x 10.5-12.5 inches rim. The equivalent tire size in the high flotation system is 29.9x13.6R15.

	Inches	Millimeters
Tire Diameter	29.9	760.5
Section Width	13.6	345
Rim Height	15	381
Sidewall Height	7.5	189.8
Circumference	94.1	2389.2

13.6"

29.9"

94.1"

15"

7.5"

673.6 Revs/Mile

To make it clear, we'll break down each part of the 345/55R15 tire size to know what these numbers represent & how they may affect your vehicle tire's performance:

How tall is a 345/55R15 tire?

A 345/55R15 tire has a height of 29.9 inches (760.5 mm). This is the measurement from the bottom to the highest point at the top of a tire through its exact center when inflated and no load.

How wide is a 345/55R15 tire?

The 345/55R15 has a width of 13.6 inches (345 mm). This is the tire measurement at its thickest point, the distance between the inner sidewall’s and the outer sidewall’s widest point, also known as section width or tread width.

345/55R15 sidewall height

The sidewall height of a 345/55R15 is 7.5 inches (189.8 mm). It’s measured from the rim to the outer edge of the tire's tread, expressed as a percentage of tire width.

What size rim do I need for 345/55R15 tire?

You can put on a rim with a height of 15 inches and a rim width ranging from 10.5-12.5 inches for a 345/55R15 tire. (Based on recommendations of The Tire and Rim Association (TRA))

Putting very wide tires on narrow rims or vice versa can result in reduced performance of the tire.

345/55R15 circumference

The 345/55R15 tire has a circumference of 94.1 inches (2389.2 mm), This is the measurement of the distance the tire covers in one full rotation.

The tire circumference is important for your vehicle's overall performance, affecting its speedometer accuracy, acceleration & fuel efficiency.

345/55R15 Revolutions

The 345/55R15 performs 673.6 revs/mile. Revolutions per mile indicate the number of times a tire rotates while it covers the distance of one mile.

Alternative Tire Sizes for 345/55R15

As a rule, you can replace the tire within a 3% difference in tire diameter (height) of the OEM tire size. Here is the full list of replacement sizes compatible with 345/55R15: