255/40R13 In Inches – Tire Size & Rim Fitment Guide

What tire size is 255/40R13 in Inches?

The 255/40R13 tire has an overall diameter of 21 inches, a section width of 10 inches, and can be mounted on 13 inches height of rim. The equivalent tire size in the high flotation system is 21x10R13.

	Inches	Millimeters
Tire Diameter	21	534.2
Section Width	10	255
Rim Height	13	330
Sidewall Height	4	102
Circumference	66.1	1678.2

10"

21"

66.1"

13"

4"

958.9 Revs/Mile

To make it clear, we'll break down each part of the 255/40R13 tire size to know what these numbers represent & how they may affect your tire's performance:

How big is a 255/40R13 tire?

A 255/40R13 tire has a height of 21 inches (534.2 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 unloaded.

How wide is a 255/40R13 tire?

The 255/40R13 tire has a width of 10 inches (255 mm). This is the measurement at its thickest point, the distance between the outer sidewall and the inner sidewall’s widest point, also called as tread width or section width.

You can put a slightly narrower or wider tire on a rim as long as it falls within the manufacturer's recommended tire width range.

255/40R13 sidewall height

The 255/40R13 has a sidewall height of 4 inches (102 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 255/40R13 tire?

You can mount the 255/40R13 tire on a rim with a height of 13 inches.

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

255/40R13 circumference

The 255/40R13 tire has a circumference of 66.1 inches (1678.2 mm), This is the measurement of the distance the tire travels in one revolution.

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

255/40R13 Revolutions

The 255/40R13 performs 958.9 revs/mile. Revolutions per mile indicate the number of times a tire rotates while it covers the distance of one mile.

Compatible Tire Sizes for 255/40R13

As a rule, you can replace the tire within a 3% difference in tire diameter (height) of the OEM tire size. However, it should be considered as a general guideline, not a hard and fast rule. Here is a list of compatible tire sizes for 255/40R13: