225/40R18 Sizing Info

Tire Size 225/40R18 in inches

Below are the most common tire sizing information in inches:

225/40R18 Height - How tall is a 225/40R18 tire in inches?

This tire size is 25.087 inches tall.

225/40R18 Width in inches - How wide is a 225/40R18 tire?

This tire size is 8.858 inches wide (tread width).

What's the Sidewall Size of a 225/40R18 Tire in Inches?

This tire size has 3.543 inch sidewalls.

Other Questions About the 225/40R18 Tire Size

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

What size rims fit a 225/40R18 tire?

This tire will fit onto 18 inch wheels.

What is the next size up from 225/40R18?

The tire sizes below are the next sizes up from 225/40R18. The table shows the increase in diameter and width for each option.

Tire Size	Diameter (in)	Width (in)	Diameter Change	Width Change
305/30R18	25.205	12.008	+ 0.118 in	+ 3.15 in
265/35R18	25.303	10.433	+ 0.217 in	+ 1.575 in
235/40R18	25.402	9.252	+ 0.315 in	+ 0.394 in
315/30R18	25.441	12.402	+ 0.354 in	+ 3.543 in
275/35R18	25.579	10.827	+ 0.492 in	+ 1.969 in

What is the next size down from 225/40R18?

The tire sizes below are the next sizes down from 225/40R18. The table shows the decrease in diameter and width for each option.

Tire Size	Diameter (in)	Width (in)	Diameter Change	Width Change
215/40R18	24.772	8.465	- 0.315 in	- 0.394 in
205/40R18	24.457	8.071	- 0.63 in	- 0.787 in
215/35R18	23.925	8.465	- 1.161 in	- 0.394 in
205/35R18	23.650	8.071	- 1.437 in	- 0.787 in
195/35R18	23.374	7.677	- 1.713 in	- 1.181 in

What does the 225 mean in tire size?

This represents the treadwidth of the tire. The tread is 225mm wide, or 25.087 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 225mm, or 90mm, which is 3.543 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 an 18 inch wheel.