255/75R16 Tire Size in Inches

31.1" tall, 10.0" wide, 7.5" sidewall

Diameter31.1"789 mm
Overall diameter31.1"789 mm
Section width10.0"255 mm
Sidewall height7.5"191 mm
Circumference97.6"2478 mm
Revolutions per mile649403 per km
Wheel diameter16"≈ 31.1x10.0R16 in inches

A 255/75R16 tire is 31.1 inches (789 mm) tall and 10.0 inches wide. The sidewall is 75% of the width, 7.5 inches, on a 16-inch wheel, and the tire turns about 649 times per mile.

In flotation terms that is about 31.1x10.0R16. People often call it a 31-inch tire.

The size most often compared with it is 275/70R16, which is 0.1" taller (+0.3%). At an indicated 60 mph you would be doing 60.2 mph on it.

255/75R16
275/70R16
Diameter difference+0.32%diameter 31.06" → 31.16"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 255/75R16

Same 16" wheel, within 20 mm of width and 10 points of aspect ratio.

SizeDiameterWidthSidewallvs 255/75R16
275/70R1631.2"10.8"7.6"+0.3%
245/80R1631.4"9.6"7.7"+1.2%
265/70R1630.6"10.4"7.3"−1.5%
245/75R1630.5"9.6"7.2"−1.9%
265/75R1631.6"10.4"7.8"+1.9%
235/85R1631.7"9.3"7.9"+2.2%
275/65R1630.1"10.8"7.0"−3.2%
255/80R1632.1"10.0"8.0"+3.2%
255/70R1630.1"10.0"7.0"−3.2%
275/75R1632.2"10.8"8.1"+3.8%

Same height on a different wheel

Sizes within 2% of 31.1" on 17" or 15" or 18" wheels.

SizeDiameterWidthSidewallvs 255/75R16
255/70R1731.1"10.0"7.0"−0.0%
275/65R1731.1"10.8"7.0"+0.1%
31x10.50R1531.0"10.5"8.0"−0.2%
275/60R1831.0"10.8"6.5"−0.2%
225/80R1731.2"8.9"7.1"+0.4%
305/55R1831.2"12.0"6.6"+0.5%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 255/75R16.

Speedometer showson 275/70R16on 245/80R16on 265/70R16
30 mph30.1 mph30.4 mph29.6 mph
45 mph45.1 mph45.5 mph44.3 mph
60 mph60.2 mph60.7 mph59.1 mph
70 mph70.2 mph70.8 mph69.0 mph

255/75R16 FAQ

How tall is a 255/75R16 tire?

31.1 inches (789 mm). The sidewall is 7.5 inches.

How wide is a 255/75R16 tire?

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

What is 255/75R16 in flotation size?

About 31.1x10.0R16.

Can I use 275/70R16 instead of 255/75R16?

275/70R16 is +0.3% in diameter, within the common 3% guideline. It is 0.8" wider.