285/40R18 Sizing Info

Tire Size 285/40R18 in inches

Below are the most common tire sizing information in inches:

285/40R18 Height - How tall is a 285/40R18 tire in inches?

This tire size is 26.976 inches tall.

285/40R18 Width in inches - How wide is a 285/40R18 tire?

This tire size is 11.22 inches wide (tread width).

What's the Sidewall Size of a 285/40R18 Tire in Inches?

This tire size has 4.488 inch sidewalls.

Other Questions About the 285/40R18 Tire Size

Here's some other common questions asked about this tire size:

What size rims fit a 285/40R18 tire?

This tire will fit onto 18 inch wheels.

What is the next size up from 285/40R18?

The tire sizes below are the next sizes up from 285/40R18. The table shows the increase in diameter and width for each option.

Tire Size	Diameter (in)	Width (in)	Diameter Change	Width Change
295/40R18	27.291	11.614	+ 0.315 in	+ 0.394 in
345/35R18	27.508	13.583	+ 0.531 in	+ 2.362 in
305/40R18	27.606	12.008	+ 0.63 in	+ 0.787 in
315/40R18	27.921	12.402	+ 0.945 in	+ 1.181 in
325/40R18	28.236	12.795	+ 1.26 in	+ 1.575 in

What is the next size down from 285/40R18?

The tire sizes below are the next sizes down from 285/40R18. The table shows the decrease in diameter and width for each option.

Tire Size	Diameter (in)	Width (in)	Diameter Change	Width Change
225/50R18	26.858	8.858	- 0.118 in	- 2.362 in
245/45R18	26.681	9.646	- 0.295 in	- 1.575 in
275/40R18	26.661	10.827	- 0.315 in	- 0.394 in
26.6x4R18	26.600	4.000	- 0.376 in	- 7.22 in
215/50R18	26.465	8.465	- 0.512 in	- 2.756 in

What does the 285 mean in tire size?

This represents the treadwidth of the tire. The tread is 285mm wide, or 26.976 inches wide.

What does the 40 mean in tire size?

This represents the sidewall height of the tire, as a percentage of the width. The sidewall height is 40% of 285mm, or 114mm, which is 4.488 inches.

What does the 18 mean in tire size?

This represents the wheel diameter that this tire size fits on. This tire size is meant to fit a 18 inch wheel.