265/35R18 Tire Size in Inches

25.3" tall, 10.4" wide, 3.7" sidewall

Diameter25.3"643 mm
Overall diameter25.3"643 mm
Section width10.4"265 mm
Sidewall height3.7"93 mm
Circumference79.5"2019 mm
Revolutions per mile797495 per km
Wheel diameter18"≈ 25.3x10.4R18 in inches

A 265/35R18 tire is 25.3 inches (643 mm) tall and 10.4 inches wide. The sidewall is 35% of the width, 3.7 inches, on a 18-inch wheel, and the tire turns about 797 times per mile.

In flotation terms that is about 25.3x10.4R18. People often call it a 25-inch tire.

The size most often compared with it is 255/40R18, which is 0.7" taller (+2.9%). At an indicated 60 mph you would be doing 61.7 mph on it.

265/35R18
255/40R18
Diameter difference+2.88%diameter 25.30" → 26.03"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 265/35R18

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

SizeDiameterWidthSidewallvs 265/35R18
255/35R1825.0"10.0"3.5"−1.1%compare
275/35R1825.6"10.8"3.8"+1.1%
285/35R1825.9"11.2"3.9"+2.2%
285/30R1824.7"11.2"3.4"−2.3%
255/40R1826.0"10.0"4.0"+2.9%compare
275/30R1824.5"10.8"3.2"−3.2%
265/40R1826.3"10.4"4.2"+4.1%
275/40R1826.7"10.8"4.3"+5.4%
285/40R1827.0"11.2"4.5"+6.6%
255/45R1827.0"10.0"4.5"+6.8%

Same height on a different wheel

Sizes within 2% of 25.3" on 20" or 17" or 16" wheels.

SizeDiameterWidthSidewallvs 265/35R18
225/30R2025.3"8.9"2.7"+0.0%
255/40R1725.0"10.0"4.0"−1.1%
185/55R1725.0"7.3"4.0"−1.2%
245/50R1625.6"9.6"4.8"+1.4%
275/40R1725.7"10.8"4.3"+1.4%
315/35R1725.7"12.4"4.3"+1.5%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 265/35R18.

Speedometer showson 255/40R18on 255/35R18on 275/35R18
30 mph30.9 mph29.7 mph30.3 mph
45 mph46.3 mph44.5 mph45.5 mph
60 mph61.7 mph59.3 mph60.7 mph
70 mph72.0 mph69.2 mph70.8 mph

265/35R18 comparisons

265/35R18 FAQ

How tall is a 265/35R18 tire?

25.3 inches (643 mm). The sidewall is 3.7 inches.

How wide is a 265/35R18 tire?

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

What is 265/35R18 in flotation size?

About 25.3x10.4R18.

Can I use 255/40R18 instead of 265/35R18?

255/40R18 is +2.9% in diameter, within the common 3% guideline. It is 0.4" narrower.