255/55R15 Tire Size in Inches

26.0" tall, 10.0" wide, 5.5" sidewall

Diameter26.0"662 mm
Overall diameter26.0"662 mm
Section width10.0"255 mm
Sidewall height5.5"140 mm
Circumference81.8"2078 mm
Revolutions per mile774481 per km
Wheel diameter15"≈ 26.0x10.0R15 in inches

A 255/55R15 tire is 26.0 inches (662 mm) tall and 10.0 inches wide. The sidewall is 55% of the width, 5.5 inches, on a 15-inch wheel, and the tire turns about 774 times per mile.

In flotation terms that is about 26.0x10.0R15. People often call it a 26-inch tire.

The size most often compared with it is 235/60R15, which is 0.1" taller (+0.2%). At an indicated 60 mph you would be doing 60.1 mph on it.

255/55R15
235/60R15
Diameter difference+0.23%diameter 26.04" → 26.10"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 255/55R15

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

SizeDiameterWidthSidewallvs 255/55R15
235/60R1526.1"9.3"5.6"+0.2%
275/50R1525.8"10.8"5.4"−0.8%
245/55R1525.6"9.6"5.3"−1.7%
245/60R1526.6"9.6"5.8"+2.0%
265/50R1525.4"10.4"5.2"−2.3%
275/55R1526.9"10.8"6.0"+3.3%
235/65R1527.0"9.3"6.0"+3.8%
255/60R1527.0"10.0"6.0"+3.9%
275/60R1528.0"10.8"6.5"+7.5%
255/65R1528.1"10.0"6.5"+7.7%

Same height on a different wheel

Sizes within 2% of 26.0" on 17" or 16" wheels.

SizeDiameterWidthSidewallvs 255/55R15
255/45R1726.0"10.0"4.5"−0.0%
285/40R1726.0"11.2"4.5"−0.3%
295/40R1726.3"11.6"4.6"+1.0%
315/35R1725.7"12.4"4.3"−1.4%
275/40R1725.7"10.8"4.3"−1.5%
245/50R1625.6"9.6"4.8"−1.5%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 255/55R15.

Speedometer showson 235/60R15on 275/50R15on 245/55R15
30 mph30.1 mph29.8 mph29.5 mph
45 mph45.1 mph44.6 mph44.3 mph
60 mph60.1 mph59.5 mph59.0 mph
70 mph70.2 mph69.4 mph68.8 mph

255/55R15 FAQ

How tall is a 255/55R15 tire?

26.0 inches (662 mm). The sidewall is 5.5 inches.

How wide is a 255/55R15 tire?

10.0 inches (255 mm) section width, measured sidewall to sidewall.

What is 255/55R15 in flotation size?

About 26.0x10.0R15.

Can I use 235/60R15 instead of 255/55R15?

235/60R15 is +0.2% in diameter, within the common 3% guideline. It is 0.8" narrower.