33x12.50R18 tire size

A 33x12.50R18 tire is 33.00 in (838.2 mm) tall and 12.50 in (317.5 mm) wide, and turns 611 revolutions per mile.

• 33.00 inOverall diameter
• 7.50 inSidewall height
• 611Revolutions per mile
• 318/60R18Metric equivalent

33x12.50R18 is a flotation size: 33.0 inches tall and 12.50 inches wide on a 18-inch wheel, which works out to roughly 318/60R18 in metric terms.

Its overall diameter is 33.00 inches, so it rolls 103.7 inches per revolution and turns about 611 times per mile.

35 other sizes in this list are within 3% of that diameter.

Compare 33x12.50R18 with plausible swaps

• 305/70R16 vs 33x12.50R18 (−0.57%)
• 285/75R16 vs 33x12.50R18 (−0.51%)
• 33x12.50R16 vs 33x12.50R18 (0.00%)
• 255/85R16 vs 33x12.50R18 (+0.20%)
• 305/65R17 vs 33x12.50R18 (−1.18%)
• 285/70R17 vs 33x12.50R18 (−0.88%)
• 33x12.50R17 vs 33x12.50R18 (0.00%)
• 255/80R17 vs 33x12.50R18 (+0.19%)
• 295/70R17 vs 33x12.50R18 (+0.79%)
• 285/75R17 vs 33x12.50R18 (+2.52%)
• 285/60R18 vs 33x12.50R18 (−4.65%)
• 265/65R18 vs 33x12.50R18 (−4.35%)
• 255/70R18 vs 33x12.50R18 (−2.86%)
• 275/65R18 vs 33x12.50R18 (−2.80%)
• 285/65R18 vs 33x12.50R18 (−1.25%)
• 265/70R18 vs 33x12.50R18 (−1.19%)
• 33x12.50R18 vs 275/70R18 (+0.48%)
• 33x12.50R18 vs 285/70R18 (+2.15%)
• 33x12.50R18 vs 295/70R18 (+3.82%)
• 33x12.50R18 vs 265/60R20 (−1.46%)
• 33x12.50R18 vs 295/55R20 (−0.68%)
• 33x12.50R18 vs 275/60R20 (−0.02%)
• 33x12.50R18 vs 33x12.50R20 (0.00%)
• 33x12.50R18 vs 305/55R20 (+0.63%)
• 33x12.50R18 vs 285/60R20 (+1.41%)
• 33x12.50R18 vs 295/60R20 (+2.84%)

Sizes within 3% of 33.00 in diameter

• 33x12.50R15 33.00 in (0.00%)
• 33x12.50R16 33.00 in (0.00%)
• 33x12.50R20 33.00 in (0.00%)
• 33x12.50R17 33.00 in (0.00%)
• 33x12.50R22 33.00 in (0.00%)
• 275/60R20 32.99 in (−0.02%)
• 255/80R17 33.06 in (+0.19%)
• 255/85R16 33.07 in (+0.20%)
• 275/70R18 33.16 in (+0.48%)
• 285/75R16 32.83 in (−0.51%)
• 305/70R16 32.81 in (−0.57%)
• 305/45R22 32.81 in (−0.58%)
• 305/55R20 33.21 in (+0.63%)
• 285/50R22 33.22 in (+0.67%)
• 295/55R20 32.78 in (−0.68%)
• 295/70R17 33.26 in (+0.79%)
• 285/70R17 32.71 in (−0.88%)
• 305/65R17 32.61 in (−1.18%)
• 265/70R18 32.61 in (−1.19%)
• 285/65R18 32.59 in (−1.25%)
• 285/60R20 33.46 in (+1.41%)
• 265/60R20 32.52 in (−1.46%)
• 325/45R22 33.52 in (+1.56%)
• 305/35R24 32.41 in (−1.80%)
• 285/55R20 32.34 in (−1.99%)
• 285/70R18 33.71 in (+2.15%)
• 285/75R17 33.83 in (+2.52%)
• 275/70R17 32.16 in (−2.55%)
• 295/35R24 32.13 in (−2.64%)
• 285/45R22 32.10 in (−2.73%)
• 275/65R18 32.07 in (−2.80%)
• 295/60R20 33.94 in (+2.84%)
• 255/75R17 32.06 in (−2.85%)
• 255/70R18 32.06 in (−2.86%)
• 255/60R20 32.05 in (−2.89%)

Open 33x12.50R18 in the tire size calculator

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.