265/75R18 Tire Size in Inches

33.6" tall, 10.4" wide, 7.8" sidewall

Diameter33.6"855 mm
Overall diameter33.6"855 mm
Section width10.4"265 mm
Sidewall height7.8"199 mm
Circumference105.7"2685 mm
Revolutions per mile599372 per km
Wheel diameter18"≈ 33.6x10.4R18 in inches

A 265/75R18 tire is 33.6 inches (855 mm) tall and 10.4 inches wide. The sidewall is 75% of the width, 7.8 inches, on a 18-inch wheel, and the tire turns about 599 times per mile.

In flotation terms that is about 33.6x10.4R18. People often call it a 34-inch tire.

The size most often compared with it is 275/70R18, which is 0.5" shorter (−1.5%). At an indicated 60 mph you would be doing 59.1 mph on it.

265/75R18
275/70R18
Diameter difference−1.46%diameter 33.65" → 33.16"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 265/75R18

Same 18" wheel, within 20 mm of width and 10 points of aspect ratio.

SizeDiameterWidthSidewallvs 265/75R18
285/70R1833.7"11.2"7.9"+0.2%
255/80R1834.1"10.0"8.0"+1.2%
275/70R1833.2"10.8"7.6"−1.5%compare
255/75R1833.1"10.0"7.5"−1.8%
275/75R1834.2"10.8"8.1"+1.8%
265/80R1834.7"10.4"8.3"+3.1%
265/70R1832.6"10.4"7.3"−3.1%
285/65R1832.6"11.2"7.3"−3.2%
285/75R1834.8"11.2"8.4"+3.5%
245/75R1832.5"9.6"7.2"−3.5%

Same height on a different wheel

Sizes within 2% of 33.6" on 20" or 17" or 19" or 16" wheels.

SizeDiameterWidthSidewallvs 265/75R18
315/55R2033.6"12.4"6.8"−0.0%
265/80R1733.7"10.4"8.3"+0.1%
265/70R1933.6"10.4"7.3"−0.1%
265/85R1633.7"10.4"8.9"+0.3%
265/65R2033.6"10.4"6.8"−0.3%
305/70R1733.8"12.0"8.4"+0.5%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 265/75R18.

Speedometer showson 275/70R18on 275/65R18on 285/70R18
30 mph29.6 mph28.6 mph30.1 mph
45 mph44.3 mph42.9 mph45.1 mph
60 mph59.1 mph57.2 mph60.1 mph
70 mph69.0 mph66.7 mph70.1 mph

265/75R18 comparisons

265/75R18 FAQ

How tall is a 265/75R18 tire?

33.6 inches (855 mm). The sidewall is 7.8 inches.

How wide is a 265/75R18 tire?

10.4 inches (265 mm) section width, measured sidewall to sidewall.

What is 265/75R18 in flotation size?

About 33.6x10.4R18.

Can I use 275/70R18 instead of 265/75R18?

275/70R18 is −1.5% in diameter, within the common 3% guideline. It is 0.4" wider.