255/60R20 Tire Size in Inches

32.0" tall, 10.0" wide, 6.0" sidewall

Diameter32.0"814 mm
Overall diameter32.0"814 mm
Section width10.0"255 mm
Sidewall height6.0"153 mm
Circumference100.7"2557 mm
Revolutions per mile629391 per km
Wheel diameter20"≈ 32.0x10.0R20 in inches

A 255/60R20 tire is 32.0 inches (814 mm) tall and 10.0 inches wide. The sidewall is 60% of the width, 6.0 inches, on a 20-inch wheel, and the tire turns about 629 times per mile.

In flotation terms that is about 32.0x10.0R20. People often call it a 32-inch tire.

The size most often compared with it is 275/55R20, which is 0.1" shorter (−0.4%). At an indicated 60 mph you would be doing 59.7 mph on it.

255/60R20
275/55R20
Diameter difference−0.43%diameter 32.05" → 31.91"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 255/60R20

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

SizeDiameterWidthSidewallvs 255/60R20
275/55R2031.9"10.8"6.0"−0.4%
245/60R2031.6"9.6"5.8"−1.5%
265/60R2032.5"10.4"6.3"+1.5%
265/55R2031.5"10.4"5.7"−1.8%
275/60R2033.0"10.8"6.5"+2.9%
255/65R2033.1"10.0"6.5"+3.1%
275/50R2030.8"10.8"5.4"−3.8%
245/55R2030.6"9.6"5.3"−4.5%
265/65R2033.6"10.4"6.8"+4.7%
275/65R2034.1"10.8"7.0"+6.3%

Same height on a different wheel

Sizes within 2% of 32.0" on 18" or 22" wheels.

SizeDiameterWidthSidewallvs 255/60R20
255/70R1832.1"10.0"7.0"+0.0%
275/65R1832.1"10.8"7.0"+0.1%
295/60R1831.9"11.6"7.0"−0.3%
315/40R2231.9"12.4"5.0"−0.4%
235/75R1831.9"9.3"6.9"−0.5%
325/40R2232.2"12.8"5.1"+0.6%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 255/60R20.

Speedometer showson 275/55R20on 245/60R20on 265/60R20
30 mph29.9 mph29.6 mph30.4 mph
45 mph44.8 mph44.3 mph45.7 mph
60 mph59.7 mph59.1 mph60.9 mph
70 mph69.7 mph69.0 mph71.0 mph

255/60R20 FAQ

How tall is a 255/60R20 tire?

32.0 inches (814 mm). The sidewall is 6.0 inches.

How wide is a 255/60R20 tire?

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

What is 255/60R20 in flotation size?

About 32.0x10.0R20.

Can I use 275/55R20 instead of 255/60R20?

275/55R20 is −0.4% in diameter, within the common 3% guideline. It is 0.8" wider.