|Tire Size||Diameter||Rim (H x W)|
|125/70R17||23.9″ (+2.9%)||17″ x n/a|
|195/45R17||23.9″ (+2.9%)||17″ x 6.0-7.5″|
|125/60R18||23.9″ (+2.9%)||18″ x n/a|
|215/35R18||23.9″ (+2.9%)||18″ x 7.0-8.5″|
|215/40R17||23.8″ (+2.5%)||17″ x 7.0-8.5″|
|245/35R17||23.8″ (+2.5%)||17″ x 8.0-9.5″|
|245/30R18||23.8″ (+2.5%)||18″ x 8.0-9.0″|
|205/35R18||23.6″ (+1.7%)||18″ x 7.0-8.0″|
|235/30R18||23.6″ (+1.7%)||18″ x n/a|
|205/40R17||23.5″ (+1.3%)||17″ x 7.0-8.0″|
|195/35R18||23.4″ (+0.9%)||18″ x n/a|
|225/30R18||23.3″ (+0.4%)||18″ x 8.0″|
|225/35R17||23.2″ (Equal)||17″ x 7.5-9.0″|
|195/40R17||23.1″ (-0.4%)||17″ x 6.5-7.5″|
|215/35R17||22.9″ (-1.3%)||17″ x 7.0-8.5″|
|165/45R17||22.8″ (-1.8%)||17″ x n/a|
165/40R18 In Inches – Tire Size & Wheel Fitment Guide
What tire size is 165/40R18 in Inches?
The 165/40R18 tire has an overall diameter of 23.2 inches, a section width of 6.5 inches, and can be mounted on 18 inches height of rim. The equivalent tire size in the high flotation system is 23.2x6.5R18.
For easy understanding, let us break down each component of the 165/40R18 tire size to know what these numbers represent and how they may affect your vehicle's performance:
How big is a 165/40R18 tire?
A 165/40R18 tire has a height of 23.2 inches (589.2 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.
How wide is a 165/40R18 tire?
The 165/40R18 tire has a width of 6.5 inches (165 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.
You can put a slightly narrower or wider tire on a rim as long as it falls within the manufacturer's recommended tire width range.
165/40R18 sidewall height
The 165/40R18 has a sidewall height of 2.6 inches (66 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 165/40R18 tire?
You can mount the 165/40R18 tire on a rim with a height of 18 inches.
Putting very narrow tires on wide rims or vice versa can result in reduced performance of the tire.
The 165/40R18 tire has a circumference of 72.9 inches (1851 mm), This is the measurement of the distance the tire travels in one revolution.
The tire circumference plays a crucial role in your vehicle's overall performance, affecting its speedometer acceleration, accuracy and fuel efficiency.
The 165/40R18 performs 869.4 revs/mile. Revolutions per mile indicate the number of times a tire rotates while it covers the distance of one mile.
Compatible Tire Sizes for 165/40R18
As a rule, you can replace the tire within a 3% difference in tire diameter (height) of the OEM tire size. However, it should be considered as a general guideline, not a hard and fast rule. Here is a list of compatible tire sizes for 165/40R18:
More tire sizes for 18" Wheel:
25″ Tire Diameter
- 135/70R18 = 25.5x5.3R18
- 145/65R18 = 25.4x5.7R18
- 155/60R18 = 25.3x6.1R18
- 205/45R18 = 25.2x8.1R18
- 215/45R18 = 25.6x8.5R18
- 225/40R18 = 25.1x8.9R18
- 235/40R18 = 25.4x9.3R18
- 245/40R18 = 25.7x9.6R18
- 255/35R18 = 25x10R18
- 265/35R18 = 25.3x10.4R18
- 275/35R18 = 25.6x10.8R18
- 285/35R18 = 25.9x11.2R18
- 295/30R18 = 25x11.6R18
- 305/30R18 = 25.2x12R18
- 315/30R18 = 25.5x12.4R18
- 335/30R18 = 25.9x13.2R18
26″ Tire Diameter
- 135/80R18 = 26.5x5.3R18
- 145/70R18 = 26x5.7R18
- 155/70R18 = 26.6x6.1R18
- 185/55R18 = 26x7.3R18
- 205/50R18 = 26.1x8.1R18
- 205/55R18 = 26.9x8.1R18
- 215/50R18 = 26.5x8.5R18
- 225/45R18 = 25.9x8.9R18
- 225/50R18 = 26.9x8.9R18
- 235/45R18 = 26.3x9.3R18
- 245/45R18 = 26.7x9.6R18
- 255/40R18 = 26x10R18
- 275/40R18 = 26.7x10.8R18
- 295/35R18 = 26.1x11.6R18
- 305/35R18 = 26.4x12R18
- 315/35R18 = 26.7x12.4R18
- 345/30R18 = 26.2x13.6R18
27″ Tire Diameter
- 145/80R18 = 27.1x5.7R18
- 145/85R18 = 27.7x5.7R18
- 155/80R18 = 27.8x6.1R18
- 165/70R18 = 27.1x6.5R18
- 205/60R18 = 27.7x8.1R18
- 215/55R18 = 27.3x8.5R18
- 225/55R18 = 27.8x8.9R18
- 235/50R18 = 27.3x9.3R18
- 245/50R18 = 27.7x9.6R18
- 255/45R18 = 27x10R18
- 265/45R18 = 27.4x10.4R18
- 275/45R18 = 27.8x10.8R18
- 285/40R18 = 27x11.2R18
- 295/40R18 = 27.3x11.6R18
- 305/40R18 = 27.6x12R18
- 315/40R18 = 27.9x12.4R18
- 325/35R18 = 27x12.8R18
- 335/35R18 = 27.2x13.2R18
- 345/35R18 = 27.5x13.6R18
*Disclaimer: The tire size is for information purposes only, the measurement is an approximation, as tire manufacturers can have slight variations in their measurements. It's recommended to refer to the vehicle manufacturer's guidelines or consult with a tire mechanic to determine the correct tire size for your vehicle.