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235/40R18 Sizing Info

235/40R18
Diameter: 25.40 inches
Sidewall Height: 3.70 inches
Radius: 12.70 inches
Rim Diameter: 18.00 inches
Section Width: 9.25 inches
Circumference: 79.80 inches
Rev/Mile: 793.97
Rim Width Range: 7.5″, 8″, 8.5″, 9″, 9.5″
List of 235/40R18 Sized Tires

All of the tires listed below will fit the size you are looking for. 

Michelin CrossClimate2
  • Rating: 4.70 / 5
  • All-Season
Get Free Shipping!
Michelin Pilot Sport 4S
  • Rating: 4.60 / 5
  • Summer
Get Free Shipping!
Michelin Primacy Tour A/S
  • Rating: 4.50 / 5
  • All-Season
Get Free Shipping!
Bridgestone Turanza QuietTrack
  • Rating: 4.50 / 5
  • All-Season
Get Free Shipping!
BFGoodrich g-Force COMP-2 A/S PLUS
  • Rating: 4.50 / 5
  • All-Season
Get Free Shipping!
Firestone Firehawk Indy 500
  • Rating: 4.50 / 5
  • Summer
Get Free Shipping!
Michelin Pilot Alpin PA4
  • Rating: 4.45 / 5
  • Snow & Ice
Get Free Shipping!
Michelin X-Ice Xi3
  • Rating: 4.41 / 5
  • Snow & Ice
Get Free Shipping!
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Tire Size 235/40R18 in inches

Below are the most common tire sizing information in inches:

235/40R18 Height - How tall is a 235/40R18 tire in inches?

This tire size is 25.402 inches tall.

235/40R18 Width in inches - How wide is a 235/40R18 tire?

This tire size is 9.252 inches wide (tread width).

What's the Sidewall Size of a 235/40R18 Tire in Inches?

This tire size has 3.701 inch sidewalls.

Other Questions About the 235/40R18 Tire Size

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

What size rims fit a 235/40R18 tire?

This tire will fit onto 18 inch wheels.

What is the next size up from 235/40R18?

The tire sizes below are the next sizes up from 235/40R18. The table shows the increase in diameter and width for each option.

Tire SizeDiameter (in)Width (in)Diameter ChangeWidth Change
315/30R1825.44112.402+ 0.039 in+ 3.15 in
275/35R1825.57910.827+ 0.177 in+ 1.575 in
245/40R1825.7179.646+ 0.315 in+ 0.394 in
285/35R1825.85411.220+ 0.453 in+ 1.969 in
335/30R1825.91313.189+ 0.512 in+ 3.937 in

What is the next size down from 235/40R18?

The tire sizes below are the next sizes down from 235/40R18. The table shows the decrease in diameter and width for each option.

Tire SizeDiameter (in)Width (in)Diameter ChangeWidth Change
185/50R1825.2837.283- 0.118 in- 1.969 in
205/45R1825.2648.071- 0.138 in- 1.181 in
225/40R1825.0878.858- 0.315 in- 0.394 in
215/40R1824.7728.465- 0.63 in- 0.787 in
205/40R1824.4578.071- 0.945 in- 1.181 in

What does the 235 mean in tire size?

This represents the treadwidth of the tire. The tread is 235mm wide, or 25.402 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 235mm, or 94mm, which is 3.701 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.



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