255/30R18 In Inches – Tire Size & Wheel Fitment Guide

What size tire is 255/30R18 in Inches?

The 255/30R18 tire has an overall diameter of 24 inches, a section width of 10 inches, and can be mounted on 18 x 8.5-9.5 inches rim. The equivalent tire size in the high flotation system is 24x10R18.

Tire Diameter24610.2
Section Width10255
Rim Height18457
Sidewall Height376.5
tire diameter
Tire Side
Tire Circumference
839.5 Revs/Mile

To help you understand, we'll break down each part of the 255/30R18 tire size to know what these numbers represent & how they may affect your tire's performance:

How wide is a 255/30R18 tire?

The 255/30R18 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.

tread width
Tread width: 10 In.

How tall is a 255/30R18 tire?

The 255/30R18 tire has a height of 24 inches (610.2 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.

Tire Diameter
Tire diameter: 24 In.

255/30R18 sidewall height

The 255/30R18 has a sidewall height of 3 inches (76.5 mm). It’s measured from the rim to the outer edge of the tire's tread, expressed as a percentage of tire width.

sidewall height
Sidewall height: 3 In.

What size rim do you need for 255/30R18 tire?

You can mount the 255/30R18 tire on a rim with a height of 18 inches and a width ranging from 8.5-9.5 inches. (Based on recommendations of The Tire and Rim Association (TRA))

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

Rim Diameter
Rim height: 18 In.
rim width
Rim width: 8.5-9.5 In.

255/30R18 circumference

The 255/30R18 tire has a circumference of 75.5 inches (1917 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.

Circumference: 75.5 In.

255/30R18 Revolutions

The 255/30R18 performs 839.5 revs/mile. Revolutions per mile indicate the number of times a tire rotates while it covers the distance of one mile.

839.5 revs/mile

Replacement Tire Sizes for 255/30R18

As a rule, you can replace the tire within a 3% difference in tire diameter (height) of the OEM tire size. Here is a list of compatible tire sizes for 255/30R18:

Tire SizeDiameterRim (H x W)
195/50R1724.7″ (+2.8%)17″ x n/a
245/40R1724.7″ (+2.8%)17″ x 8.0-9.5″
285/30R1824.7″ (+2.8%)18″ x 9.5-10.5″
175/55R1724.6″ (+2.4%)17″ x 5.0-6.0″
215/45R1724.6″ (+2.4%)17″ x 7.0-8.0″
275/35R1724.6″ (+2.4%)17″ x 9.0-11.0″
235/30R1924.6″ (+2.4%)19″ x 8.5″
205/40R1824.5″ (+2%)18″ x 7.0-8.0″
235/35R1824.5″ (+2%)18″ x 8.0-9.5″
135/70R1724.4″ (+1.6%)17″ x n/a
235/40R1724.4″ (+1.6%)17″ x 8.0-9.5″
135/60R1824.4″ (+1.6%)18″ x n/a
185/50R1724.3″ (+1.2%)17″ x 4.5-6.0″
205/45R1724.3″ (+1.2%)17″ x 6.5-7.5″
265/35R1724.3″ (+1.2%)17″ x 9.0-10.5″
265/30R1824.3″ (+1.2%)18″ x 9.0-10.0″
225/30R1924.3″ (+1.2%)19″ x 8.0″
175/45R1824.2″ (+0.8%)18″ x n/a
225/35R1824.2″ (+0.8%)18″ x 7.5-9.0″
225/40R1724.1″ (+0.4%)17″ x 7.5-9.0″
125/70R1723.9″ (-0.4%)17″ x n/a
195/45R1723.9″ (-0.4%)17″ x 6.0-7.5″
125/60R1823.9″ (-0.4%)18″ x n/a
215/35R1823.9″ (-0.4%)18″ x 7.0-8.5″
215/40R1723.8″ (-0.8%)17″ x 7.0-8.5″
245/35R1723.8″ (-0.8%)17″ x 8.0-9.5″
245/30R1823.8″ (-0.8%)18″ x 8.0-9.0″
205/35R1823.6″ (-1.7%)18″ x 7.0-8.0″
235/30R1823.6″ (-1.7%)18″ x n/a
205/40R1723.5″ (-2.1%)17″ x 7.0-8.0″
195/35R1823.4″ (-2.6%)18″ x n/a

More tire sizes for 18" Wheel:

23″ Tire Diameter

24″ Tire Diameter

25″ Tire Diameter

26″ Tire Diameter

27″ Tire Diameter

28″ Tire Diameter

29″ Tire Diameter

30″ Tire Diameter

31″ Tire Diameter

32″ Tire Diameter

33″ Tire Diameter

34″ Tire Diameter

35″ Tire Diameter

36″ Tire Diameter

38″ Tire Diameter

*Disclaimer: Please note that our tire dimensions & measurements are an approximation number, while the tire manufacturers may have different ways in calculating or rounding numbers. We recommend referring to the vehicle manufacturer's manual or checking with the tire technician to find out the correct tire size for your vehicle.

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