375/20R21 In Inches – Tire Size & Wheel Fitment Guide

What tire size is 375/20R21 in Inches?

The 375/20R21 tire has an overall diameter of 26.9 inches, a section width of 14.8 inches, and can be mounted on 21 inches height of rim. The equivalent tire size in the high flotation system is 26.9x14.8R21.

Tire Diameter26.9683.4
Section Width14.8375
Rim Height21533
Sidewall Height375
tire diameter
Tire Side
Tire Circumference
749.6 Revs/Mile

To make it clear, we'll break down each part of the 375/20R21 tire size to know what these numbers represent & how they may affect your tire's performance:

How big is a 375/20R21 tire?

A 375/20R21 tire has a height of 26.9 inches (683.4 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: 26.9 In.

How wide is a 375/20R21 tire?

The 375/20R21 tire has a width of 14.8 inches (375 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: 14.8 In.

375/20R21 sidewall height

The 375/20R21 has a sidewall height of 3 inches (75 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: 3 In.

What size rim do I need for 375/20R21 tire?

You can mount the 375/20R21 tire on a rim with a height of 21 inches.

Putting very narrow tires on wide rims or vice versa can result in reduced performance of the tire.

Rim Diameter
Rim height: 21 In.
rim width
Rim width: In.

375/20R21 circumference

The 375/20R21 tire has a circumference of 84.5 inches (2147 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: 84.5 In.

375/20R21 Revolutions

The 375/20R21 performs 749.6 revs/mile. Revolutions per mile indicate the number of times a tire rotates while it covers the distance of one mile.

749.6 revs/mile

Compatible Tire Sizes for 375/20R21

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 375/20R21:

Tire SizeDiameterRim (H x W)
195/50R2027.7″ (+2.9%)20″ x 5.5-7.0″
245/40R2027.7″ (+2.9%)20″ x 8.0-9.5″
325/30R2027.7″ (+2.9%)20″ x 11.0-12.0″
285/30R2127.7″ (+2.9%)21″ x 9.5-10.5″
175/55R2027.6″ (+2.5%)20″ x 5.0-6.0″
215/45R2027.6″ (+2.5%)20″ x 7.0-8.0″
275/35R2027.6″ (+2.5%)20″ x 9.0-11.0″
235/30R2227.6″ (+2.5%)22″ x 8.5″
285/25R2227.6″ (+2.5%)22″ x 10.5″
235/35R2127.5″ (+2.2%)21″ x n/a
275/30R2127.5″ (+2.2%)21″ x 9.0-10.0″
145/65R2027.4″ (+1.8%)20″ x n/a
235/40R2027.4″ (+1.8%)20″ x 8.0-9.5″
315/30R2027.4″ (+1.8%)20″ x 10.5-11.5″
325/25R2127.4″ (+1.8%)21″ x 11.5-12.5″
275/25R2227.4″ (+1.8%)22″ x 10.0″
155/60R2027.3″ (+1.5%)20″ x 4.5-5.5″
265/35R2027.3″ (+1.5%)20″ x 9.0-10.5″
265/30R2127.3″ (+1.5%)21″ x 9.0-10.0″
225/30R2227.3″ (+1.5%)22″ x n/a
305/30R2027.2″ (+1.1%)20″ x 10.5-11.5″
265/25R2227.2″ (+1.1%)22″ x n/a
225/40R2027.1″ (+0.7%)20″ x 7.5-9.0″
255/35R2027″ (+0.4%)20″ x 8.5-10.0″
295/30R2027″ (+0.4%)20″ x 10.0-11.0″
255/30R2127″ (+0.4%)21″ x 8.5-9.5″
305/25R2127″ (+0.4%)21″ x 10.5-11.5″
145/60R2026.9″ (Equal)20″ x n/a
245/35R2026.8″ (-0.4%)20″ x 8.0-9.5″
345/25R2026.8″ (-0.4%)20″ x 12.0-13.0″
245/30R2126.8″ (-0.4%)21″ x 8.0-9.0″
295/25R2126.8″ (-0.4%)21″ x 10.0-11.0″
285/30R2026.7″ (-0.7%)20″ x 9.5-10.5″
335/25R2026.6″ (-1.1%)20″ x 11.5-12.5″
235/30R2126.6″ (-1.1%)21″ x n/a
235/35R2026.5″ (-1.5%)20″ x 8.0-9.5″
275/30R2026.5″ (-1.5%)20″ x 9.0-10.0″
325/25R2026.4″ (-1.9%)20″ x 11.5-12.5″
275/25R2126.4″ (-1.9%)21″ x 10.0″
265/30R2026.3″ (-2.3%)20″ x 9.0-10.0″
225/35R2026.2″ (-2.7%)20″ x 7.5-9.0″
315/25R2026.2″ (-2.7%)20″ x 11.0-12.0″

*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.

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More tire sizes for 21" Wheel:

26″ Tire Diameter

27″ Tire Diameter

28″ Tire Diameter

29″ Tire Diameter

30″ Tire Diameter

31″ Tire Diameter

32″ Tire Diameter

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