275/55R15 Tire Size in Inches

26.9" tall, 10.8" wide, 6.0" sidewall

Diameter26.9"684 mm
Overall diameter26.9"684 mm
Section width10.8"275 mm
Sidewall height6.0"151 mm
Circumference84.5"2147 mm
Revolutions per mile749466 per km
Wheel diameter15"≈ 26.9x10.8R15 in inches

A 275/55R15 tire is 26.9 inches (684 mm) tall and 10.8 inches wide. The sidewall is 55% of the width, 6.0 inches, on a 15-inch wheel, and the tire turns about 749 times per mile.

In flotation terms that is about 26.9x10.8R15. People often call it a 27-inch tire.

The size most often compared with it is 255/60R15, which is 0.1" taller (+0.5%). At an indicated 60 mph you would be doing 60.3 mph on it.

275/55R15
255/60R15
Diameter difference+0.51%diameter 26.91" → 27.05"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 275/55R15

Same 15" wheel, within 20 mm of width and 10 points of aspect ratio.

SizeDiameterWidthSidewallvs 275/55R15
255/60R1527.0"10.0"6.0"+0.5%
295/50R1526.6"11.6"5.8"−1.1%
255/55R1526.0"10.0"5.5"−3.2%
295/55R1527.8"11.6"6.4"+3.2%
275/60R1528.0"10.8"6.5"+4.0%
275/50R1525.8"10.8"5.4"−4.0%
255/65R1528.1"10.0"6.5"+4.2%
265/50R1525.4"10.4"5.2"−5.5%
285/60R1528.5"11.2"6.7"+5.8%
265/65R1528.6"10.4"6.8"+6.1%

Same height on a different wheel

Sizes within 2% of 26.9" on 14" or 17" wheels.

SizeDiameterWidthSidewallvs 275/55R15
255/65R1427.1"10.0"6.5"+0.5%
285/45R1727.1"11.2"5.0"+0.7%
215/75R1426.7"8.5"6.3"−0.8%
205/60R1726.7"8.1"4.8"−0.8%
305/40R1726.6"12.0"4.8"−1.1%
265/50R1727.4"10.4"5.2"+1.9%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 275/55R15.

Speedometer showson 255/60R15on 295/50R15on 255/55R15
30 mph30.2 mph29.7 mph29.0 mph
45 mph45.2 mph44.5 mph43.6 mph
60 mph60.3 mph59.3 mph58.1 mph
70 mph70.4 mph69.2 mph67.7 mph

275/55R15 FAQ

How tall is a 275/55R15 tire?

26.9 inches (684 mm). The sidewall is 6.0 inches.

How wide is a 275/55R15 tire?

10.8 inches (275 mm) section width, measured sidewall to sidewall.

What is 275/55R15 in flotation size?

About 26.9x10.8R15.

Can I use 255/60R15 instead of 275/55R15?

255/60R15 is +0.5% in diameter, within the common 3% guideline. It is 0.8" narrower.