155/85R18 In Inches – Tire Size & Wheel Fitment Guide


What tire size is 155/85R18 in Inches?

The 155/85R18 tire has an overall diameter of 28.4 inches, a section width of 6.1 inches, and can be mounted on 18 inches height of rim. The equivalent tire size in the high flotation system is 28.4x6.1R18.

InchesMillimeters
Tire Diameter28.4720.7
Section Width6.1155
Rim Height18457
Sidewall Height5.2131.8
Circumference89.12264.1
tire diameter
6.1"
28.4"
Tire Side
Tire Circumference
89.1"
18"
5.2"
710.8 Revs/Mile

To make it clear, we'll break down each part of the 155/85R18 tire size to know what these numbers represent & how they may affect your tire's performance:



How big is a 155/85R18 tire?

A 155/85R18 tire has a height of 28.4 inches (720.7 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.

Tire Diameter
Tire diameter: 28.4 In.


How wide is a 155/85R18 tire?

The 155/85R18 tire has a width of 6.1 inches (155 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.

tread width
Tread width: 6.1 In.


155/85R18 sidewall height

The 155/85R18 has a sidewall height of 5.2 inches (131.8 mm). It’s measured from the rim to the outer edge of the tire's tread, expressed as a percentage of tire width.

sidewall height
Sidewall height: 5.2 In.


What size rim do I need for 155/85R18 tire?

You can mount the 155/85R18 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.

Rim Diameter
Rim height: 18 In.
rim width
Rim width: In.


155/85R18 circumference

The 155/85R18 tire has a circumference of 89.1 inches (2264.1 mm), This is the measurement of the distance the tire travels in one revolution.

The tire circumference is important for your vehicle's overall performance, affecting its speedometer acceleration, accuracy and fuel efficiency.

Circumference
Circumference: 89.1 In.


155/85R18 Revolutions

The 155/85R18 performs 710.8 revs/mile. Revolutions per mile indicate the number of times a tire rotates while it covers the distance of one mile.

Revolutions
710.8 revs/mile


Compatible Tire Sizes for 155/85R18

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 155/85R18:

Tire SizeDiameterRim (H x W)
285/50R1829.2″ (+2.7%)18″ x 8.0-10.0″
235/55R1929.2″ (+2.7%)19″ x 6.5-8.5″
235/60R1829.1″ (+2.4%)18″ x 6.5-8.5″
285/45R1929.1″ (+2.4%)19″ x 9.0-10.5″
145/80R2029.1″ (+2.4%)20″ x n/a
295/35R2129.1″ (+2.4%)21″ x 10.0-11.5″
235/65R1729″ (+2.1%)17″ x 6.5-8.5″
255/60R1729″ (+2.1%)17″ x 7.0-9.0″
155/90R1829″ (+2.1%)18″ x n/a
175/80R1829″ (+2.1%)18″ x n/a
255/55R1829″ (+2.1%)18″ x 7.0-9.0″
255/50R1929″ (+2.1%)19″ x 7.0-9.0″
255/45R2029″ (+2.1%)20″ x 8.0-9.5″
285/40R2029″ (+2.1%)20″ x 9.5-11.0″
325/35R2029″ (+2.1%)20″ x 11.0-13.0″
255/40R2129″ (+2.1%)21″ x 8.5-10.0″
215/70R1728.9″ (+1.7%)17″ x 5.5-7.0″
275/55R1728.9″ (+1.7%)17″ x 7.5-9.5″
315/40R1928.9″ (+1.7%)19″ x 11.0-12.0″
285/35R2128.9″ (+1.7%)21″ x 9.5-11.0″
275/50R1828.8″ (+1.4%)18″ x 7.5-9.5″
305/45R1828.8″ (+1.4%)18″ x 9.5-11.5″
155/80R1928.8″ (+1.4%)19″ x n/a
165/90R1728.7″ (+1%)17″ x n/a
225/55R1928.7″ (+1%)19″ x 6.0-8.0″
275/45R1928.7″ (+1%)19″ x 8.5-10.5″
245/45R2028.7″ (+1%)20″ x 7.5-9.0″
275/40R2028.7″ (+1%)20″ x 9.0-11.0″
315/35R2028.7″ (+1%)20″ x 10.5-12.5″
245/40R2128.7″ (+1%)21″ x 8.0-9.5″
325/30R2128.7″ (+1%)21″ x 11.0-12.0″
245/60R1728.6″ (+0.7%)17″ x 7.0-8.5″
225/60R1828.6″ (+0.7%)18″ x 6.0-8.0″
245/55R1828.6″ (+0.7%)18″ x 7.0-8.5″
245/50R1928.6″ (+0.7%)19″ x 7.0-8.5″
275/35R2128.6″ (+0.7%)21″ x 9.0-11.0″
225/65R1728.5″ (+0.4%)17″ x 6.0-8.0″
265/55R1728.5″ (+0.4%)17″ x 7.5-9.5″
295/45R1828.5″ (+0.4%)18″ x 9.5-11.0″
345/35R1928.5″ (+0.4%)19″ x 11.5-13.5″
265/50R1828.4″ (Equal)18″ x 7.5-9.5″
265/45R1928.4″ (Equal)19″ x 8.5-10.0″
305/35R2028.4″ (Equal)20″ x 10.0-12.0″
315/30R2128.4″ (Equal)21″ x 10.5-11.5″
235/50R1928.3″ (-0.4%)19″ x 6.5-8.5″
295/40R1928.3″ (-0.4%)19″ x 10.0-11.5″
235/45R2028.3″ (-0.4%)20″ x 7.5-9.0″
265/40R2028.3″ (-0.4%)20″ x 9.0-10.5″
265/35R2128.3″ (-0.4%)21″ x 9.0-10.5″
315/45R1728.2″ (-0.7%)17″ x 10.0-12.0″
235/55R1828.2″ (-0.7%)18″ x 6.5-8.5″
305/30R2128.2″ (-0.7%)21″ x 10.5-11.5″
235/60R1728.1″ (-1.1%)17″ x 6.5-8.5″
285/45R1828.1″ (-1.1%)18″ x 9.0-10.5″
145/80R1928.1″ (-1.1%)19″ x n/a
295/35R2028.1″ (-1.1%)20″ x 10.0-11.5″
345/30R2028.1″ (-1.1%)20″ x 12.0-13.0″
155/90R1728″ (-1.4%)17″ x n/a
215/65R1728″ (-1.4%)17″ x 6.0-7.5″
255/55R1728″ (-1.4%)17″ x 7.0-9.0″
255/50R1828″ (-1.4%)18″ x 7.0-9.0″
255/45R1928″ (-1.4%)19″ x 8.0-9.5″
285/40R1928″ (-1.4%)19″ x 9.5-11.0″
225/45R2028″ (-1.4%)20″ x 8.0-9.5″
255/40R2028″ (-1.4%)20″ x 8.5-10.0″
255/35R2128″ (-1.4%)21″ x 8.5-10.0″
295/30R2128″ (-1.4%)21″ x 10.0-11.0″
355/25R2128″ (-1.4%)21″ x 12.5-13.5″
345/40R1727.9″ (-1.8%)17″ x 11.5-13.5″
315/40R1827.9″ (-1.8%)18″ x 10.5-12.5″
155/65R2027.9″ (-1.8%)20″ x n/a
285/35R2027.9″ (-1.8%)20″ x 9.5-11.0″
335/30R2027.9″ (-1.8%)20″ x 11.5-12.5″
275/50R1727.8″ (-2.2%)17″ x 7.5-9.5″
305/45R1727.8″ (-2.2%)17″ x 9.5-11.5″
155/80R1827.8″ (-2.2%)18″ x n/a
165/60R2027.8″ (-2.2%)20″ x n/a
245/35R2127.8″ (-2.2%)21″ x 8.0-9.5″
245/35R2127.8″ (-2.2%)21″ x 8.0-9.0″
145/85R1827.7″ (-2.5%)18″ x n/a
205/60R1827.7″ (-2.5%)18″ x 5.0-7.5″
225/55R1827.7″ (-2.5%)18″ x 6.0-8.0″
275/45R1827.7″ (-2.5%)18″ x 8.5-10.5″
245/45R1927.7″ (-2.5%)19″ x 7.5-9.0″
275/40R1927.7″ (-2.5%)19″ x 9.0-11.0″
315/35R1927.7″ (-2.5%)19″ x n/a
195/50R2027.7″ (-2.5%)20″ x 5.5-7.0″
245/40R2027.7″ (-2.5%)20″ x 8.0-9.5″
325/30R2027.7″ (-2.5%)20″ x 11.0-12.0″
285/30R2127.7″ (-2.5%)21″ x 9.5-10.5″
225/60R1727.6″ (-2.9%)17″ x 6.0-8.0″
245/55R1727.6″ (-2.9%)17″ x 7.0-8.5″
245/50R1827.6″ (-2.9%)18″ x 7.0-8.5″
305/40R1827.6″ (-2.9%)18″ x 10.0-12.0″
175/55R2027.6″ (-2.9%)20″ x 5.0-6.0″
215/45R2027.6″ (-2.9%)20″ x 7.0-8.0″
275/35R2027.6″ (-2.9%)20″ x 9.0-11.0″

More tire sizes for 18" Wheel:

23″ Tire Diameter

24″ Tire Diameter

25″ Tire Diameter


26″ Tire Diameter

27″ Tire Diameter

28″ Tire Diameter


29″ Tire Diameter

30″ Tire Diameter

31″ Tire Diameter


32″ Tire Diameter

33″ Tire Diameter

34″ Tire Diameter


35″ Tire Diameter

36″ Tire Diameter

38″ Tire Diameter


*Disclaimer: Please note that our tire dimensions & measurements are an approximation number, while the tire manufacturers may have different ways in calculating or rounding numbers. We recommend referring to the vehicle manufacturer's manual or checking with the tire technician to find out the correct tire size for your vehicle.


Share on:

Leave a Comment