255/35R19 Tire Size in Inches

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

255/35R19
26.0" tall × 10.0" wide
On a 19-inch wheel · roughly 26.0x10.0R19 in flotation sizing
MeasurementInchesMillimetres
Overall diameter26.03661
Section width10.04255
Sidewall height3.5189.2
Wheel diameter19483
Circumference81.82077
Revolutions per mile775 (481 per km)

What 255/35R19 means

255 is the section width in millimetres (10.0 in). 35 is the aspect ratio: the sidewall is 35% as tall as the tire is wide, which works out to 89.2 mm or 3.5 in. R19 is a radial tire for a 19-inch wheel.

Overall diameter is the wheel plus two sidewalls: 19 + 2 × 3.51 = 26.0 inches. These are the nominal dimensions every maker builds to; a real 255/35R19 can measure a few tenths of an inch differently by model and inflation.

Closest equivalent sizes

Common sizes within the usual 3% of 255/35R19's overall diameter. Confirm load index, speed rating and rim width before swapping.

SizeDiameterWidthChangeSpeedometer at 60
215/65R15 new wheels 26.0 in 8.5 in -0.1% really 59.9 mph
195/65R16 new wheels 26.0 in 7.7 in -0.2% really 59.9 mph
225/45R18 new wheels 26.0 in 8.9 in -0.2% really 59.9 mph
225/40R19 26.1 in 8.9 in +0.2% really 60.1 mph
205/75R14 new wheels 26.1 in 8.1 in +0.3% really 60.2 mph
215/60R16 new wheels 26.2 in 8.5 in +0.5% really 60.3 mph

Speedometer if you switch to 225/40R19

Your speedometer stays calibrated for 255/35R19. 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 255/35R19 with any size →

Shop 255/35R19 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 255/35R19 tire is 26.0 inches (661 mm) tall overall. That is the 19-inch wheel plus two sidewalls of 3.5 inches each (35% of the 255 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 255 mm, or 10.0 inches, measured sidewall to sidewall on the recommended rim width. The tread itself is narrower than that. In flotation sizing, 255/35R19 is roughly a 26.0x10.0R19.

215/65R15 is the closest common size, at -0.1% overall diameter (26.0 in against 26.0 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 775 revolutions per mile (481 per kilometre), from its 26.0-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 255/40R19 255/45R19 255/50R19 255/55R19 265/50R19 275/35R19 275/40R19 275/45R19 285/45R19 275/55R19 285/40R19