33x12.50R18 Tire Size in Metric

33.0" tall, 12.5" wide on a 18" wheel

Diameter33.0"838 mm
Overall diameter33.0"838 mm
Section width12.5"318 mm
Sidewall height7.5"191 mm
Circumference103.7"2633 mm
Revolutions per mile611380 per km
Wheel diameter18"flotation size

A 33x12.50R18 tire is 33.0 inches tall and 12.5 inches wide and mounts on a 18-inch wheel, which leaves a 7.5-inch sidewall. It turns about 611 times per mile.

Metric sizes within half an inch of its height are 255/75R18 (33.1"), 295/65R18 (33.1"), 275/70R18 (33.2"), 235/80R18 (32.8"), 325/60R18 (33.4"), 265/70R18 (32.6"), 285/65R18 (32.6"), 275/60R20 (33.0"). Metric tires are usually a little narrower than the flotation width suggests, so compare widths before you buy.

The size most often compared with it is 325/60R18, which is 0.4" taller (+1.1%). At an indicated 60 mph you would be doing 60.6 mph on it.

33x12.50R18
325/60R18
Diameter difference+1.07%diameter 33.00" → 33.35"
CurrentNew
CurrentNewDifference

Speedometer

ShowsActual speed

Gear ratio to match

–enter your current axle ratio

Sizes near 33x12.50R18

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

SizeDiameterWidthSidewallvs 33x12.50R18
325/60R1833.4"12.8"7.7"+1.1%
305/60R1832.4"12.0"7.2"−1.8%
305/65R1833.6"12.0"7.8"+1.8%
315/65R1834.1"12.4"8.1"+3.4%
325/65R1834.6"12.8"8.3"+5.0%
305/55R1831.2"12.0"6.6"−5.4%
305/70R1834.8"12.0"8.4"+5.5%
35x12.50R1835.0"12.5"8.5"+6.1%
315/70R1835.4"12.4"8.7"+7.2%
325/70R1835.9"12.8"9.0"+8.8%

Same height on a different wheel

Sizes within 2% of 33.0" on 16" or 17" or 20" or 19" wheels.

SizeDiameterWidthSidewallvs 33x12.50R18
33x12.50R1633.0"12.5"8.5"±0.0%
33x12.50R1733.0"12.5"8.0"±0.0%
33x12.50R2033.0"12.5"6.5"±0.0%
275/60R2033.0"10.8"6.5"−0.0%
255/65R2033.1"10.0"6.5"+0.2%
255/70R1933.1"10.0"7.0"+0.2%

Metric equivalents of 33x12.50R18

SizeDiameterWidthSidewallvs 33x12.50R18
255/75R1833.1"10.0"7.5"+0.2%
295/65R1833.1"11.6"7.5"+0.3%
275/70R1833.2"10.8"7.6"+0.5%
235/80R1832.8"9.3"7.4"−0.6%
325/60R1833.4"12.8"7.7"+1.1%
265/70R1832.6"10.4"7.3"−1.2%
285/65R1832.6"11.2"7.3"−1.3%
275/60R2033.0"10.8"6.5"−0.0%

Speedometer with a different size

Actual speed when the speedometer is calibrated for 33x12.50R18.

Speedometer showson 325/60R18on 305/60R18on 305/65R18
30 mph30.3 mph29.5 mph30.6 mph
45 mph45.5 mph44.2 mph45.8 mph
60 mph60.6 mph58.9 mph61.1 mph
70 mph70.8 mph68.7 mph71.3 mph

33x12.50R18 FAQ

How tall is a 33x12.50R18 tire?

33.0 inches (838 mm), with a 7.5-inch sidewall on a 18-inch wheel.

What is 33x12.50R18 in metric?

Metric sizes of about the same height are 255/75R18 (33.1"), 295/65R18 (33.1"), 275/70R18 (33.2"), 235/80R18 (32.8").

How many revolutions per mile does a 33x12.50R18 make?

About 611, or 380 per kilometer.