285/70R18 In Inches – Tire Size & Rim Fitment Guide

What size tire is 285/70R18 in Inches?

The 285/70R18 tire has an overall diameter of 33.7 inches, a section width of 11.2 inches, and can be mounted on 18 x 7.5-9.5 inches rim. The equivalent tire size in the high flotation system is 33.7x11.2R18.

	Inches	Millimeters
Tire Diameter	33.7	856.2
Section Width	11.2	285
Rim Height	18	457
Sidewall Height	7.9	199.5
Circumference	105.9	2689.8

11.2"

33.7"

105.9"

18"

7.9"

598.3 Revs/Mile

To make it clear, we'll break down each part of the 285/70R18 tire size to know what these numbers represent & how they may affect your vehicle tire's performance:

How tall is a 285/70R18 tire?

A 285/70R18 tire has a height of 33.7 inches (856.2 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 no load.

How wide is a 285/70R18 tire?

The 285/70R18 has a width of 11.2 inches (285 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.

285/70R18 sidewall height

The sidewall height of a 285/70R18 is 7.9 inches (199.5 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 285/70R18 tire?

You can put on a rim with a height of 18 inches and a rim width ranging from 7.5-9.5 inches for a 285/70R18 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.

285/70R18 circumference

The 285/70R18 tire has a circumference of 105.9 inches (2689.8 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.

285/70R18 Revolutions

The 285/70R18 performs 598.3 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 285/70R18

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 285/70R18: