275/40R22 Tire Size in Inches

Diameter, width, sidewall and the closest equivalent sizes, computed from the size code.

275/40R22
30.7" tall × 10.8" wide
On a 22-inch wheel · roughly 30.7x10.8R22 in flotation sizing
MeasurementInchesMillimetres
Overall diameter30.66779
Section width10.83275
Sidewall height4.33110.0
Wheel diameter22559
Circumference96.32447
Revolutions per mile658 (409 per km)

What 275/40R22 means

275 is the section width in millimetres (10.8 in). 40 is the aspect ratio: the sidewall is 40% as tall as the tire is wide, which works out to 110.0 mm or 4.3 in. R22 is a radial tire for a 22-inch wheel.

Overall diameter is the wheel plus two sidewalls: 22 + 2 × 4.33 = 30.7 inches. These are the nominal dimensions every maker builds to; a real 275/40R22 can measure a few tenths of an inch differently by model and inflation.

Closest equivalent sizes

Common sizes within the usual 3% of 275/40R22's overall diameter. Confirm load index, speed rating and rim width before swapping.

SizeDiameterWidthChangeSpeedometer at 60
265/70R16 new wheels 30.6 in 10.4 in -0.2% really 59.9 mph
275/45R21 new wheels 30.7 in 10.8 in +0.3% really 60.2 mph
265/65R17 new wheels 30.6 in 10.4 in -0.3% really 59.8 mph
245/65R18 new wheels 30.5 in 9.6 in -0.4% really 59.8 mph
265/60R18 new wheels 30.5 in 10.4 in -0.5% really 59.7 mph
245/70R17 new wheels 30.5 in 9.6 in -0.5% really 59.7 mph

Speedometer if you switch to 265/70R16

Your speedometer stays calibrated for 275/40R22. With a shorter tire you travel slower than it shows.

Speedometer readsTrue speed
30 mph29.9 mph
45 mph44.9 mph
55 mph54.9 mph
65 mph64.9 mph
75 mph74.9 mph
Compare 275/40R22 with any size →

Shop 275/40R22 tires

Check the load index and speed rating on your door-jamb placard before you buy, especially for LT tires used for towing.

See 275/40R22 tires on Amazon →

As an Amazon Associate we earn from qualifying purchases.

Frequently Asked Questions

A 275/40R22 tire is 30.7 inches (779 mm) tall overall. That is the 22-inch wheel plus two sidewalls of 4.3 inches each (40% of the 275 mm section width). Expect a real tire to measure within a few tenths of an inch of this, depending on the model and inflation.

The section width is 275 mm, or 10.8 inches, measured sidewall to sidewall on the recommended rim width. The tread itself is narrower than that. In flotation sizing, 275/40R22 is roughly a 30.7x10.8R22.

265/70R16 is the closest common size, at -0.2% overall diameter (30.6 in against 30.7 in). Most makers treat about 3% as the limit for a swap without speedometer or clearance problems, but always confirm load index, speed rating and wheel width before changing size.

About 658 revolutions per mile (409 per kilometre), from its 30.7-inch rolling diameter. Real-world figures run slightly higher because a loaded tire squats. This number is what your speedometer and odometer are calibrated against.

Last updated: October 2, 2026

Compare any sizes

The full calculator compares up to three sizes with speedometer error, clearance change and a to-scale diagram.

Open the tire size calculator

Other 22-inch sizes

265/40R22 285/40R22 285/45R22 305/40R22 255/30R22 265/35R22 285/35R22 295/30R22 305/45R22