275/55R19 Tire Size in Inches

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

275/55R19
30.9" tall × 10.8" wide
On a 19-inch wheel · roughly 30.9x10.8R19 in flotation sizing
MeasurementInchesMillimetres
Overall diameter30.91785
Section width10.83275
Sidewall height5.95151.2
Wheel diameter19483
Circumference97.12466
Revolutions per mile652 (405 per km)

What 275/55R19 means

275 is the section width in millimetres (10.8 in). 55 is the aspect ratio: the sidewall is 55% as tall as the tire is wide, which works out to 151.2 mm or 6.0 in. R19 is a radial tire for a 19-inch wheel.

Overall diameter is the wheel plus two sidewalls: 19 + 2 × 5.95 = 30.9 inches. These are the nominal dimensions every maker builds to; a real 275/55R19 can measure a few tenths of an inch differently by model and inflation.

Closest equivalent sizes

Common sizes within the usual 3% of 275/55R19's overall diameter. Confirm load index, speed rating and rim width before swapping.

SizeDiameterWidthChangeSpeedometer at 60
285/40R22 new wheels 31.0 in 11.2 in +0.2% really 60.1 mph
275/50R20 new wheels 30.8 in 10.8 in -0.3% really 59.8 mph
275/60R18 new wheels 31.0 in 10.8 in +0.3% really 60.2 mph
255/55R20 new wheels 31.0 in 10.0 in +0.4% really 60.3 mph
255/65R18 new wheels 31.1 in 10.0 in +0.5% really 60.3 mph
255/70R17 new wheels 31.1 in 10.0 in +0.5% really 60.3 mph

Speedometer if you switch to 285/40R22

Your speedometer stays calibrated for 275/55R19. With a taller tire you travel faster than it shows.

Speedometer readsTrue speed
30 mph30.1 mph
45 mph45.1 mph
55 mph55.1 mph
65 mph65.1 mph
75 mph75.2 mph
Compare 275/55R19 with any size →

Shop 275/55R19 tires

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

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Frequently Asked Questions

A 275/55R19 tire is 30.9 inches (785 mm) tall overall. That is the 19-inch wheel plus two sidewalls of 6.0 inches each (55% 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, 275/55R19 is roughly a 30.9x10.8R19.

285/40R22 is the closest common size, at +0.2% overall diameter (31.0 in against 30.9 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 652 revolutions per mile (405 per kilometre), from its 30.9-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

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Other 19-inch sizes

225/40R19 225/45R19 225/55R19 235/35R19 235/40R19 235/45R19 235/50R19 235/55R19 245/35R19 245/40R19 245/45R19 245/50R19 245/55R19 255/35R19 255/40R19 255/45R19 255/50R19 255/55R19 265/50R19 275/35R19 275/40R19 275/45R19 285/45R19 285/40R19