255/70R18 tire size

A 255/70R18 tire is 32.06 in (814.2 mm) tall and 10.04 in (255.0 mm) wide, and turns 629 revolutions per mile.

• 32.06 inOverall diameter
• 7.03 inSidewall height
• 629Revolutions per mile
• 32.1x10.0R18Flotation equivalent

255/70R18 is a 18-inch tire with a 255 mm (10.04 in) section width and a 70% aspect ratio, giving a 7.03-inch sidewall and a flotation-style size of about 32.1x10.0R18.

Its overall diameter is 32.06 inches, so it rolls 100.7 inches per revolution and turns about 629 times per mile.

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

Compare 255/70R18 with plausible swaps

• 265/75R16 vs 255/70R18 (−1.27%)
• 235/85R16 vs 255/70R18 (−1.02%)
• 285/65R17 vs 255/70R18 (−1.46%)
• 265/70R17 vs 255/70R18 (−1.40%)
• 235/80R17 vs 255/70R18 (−0.79%)
• 255/75R17 vs 255/70R18 (+0.01%)
• 275/70R17 vs 255/70R18 (+0.32%)
• 255/65R18 vs 255/70R18 (−3.13%)
• 265/65R18 vs 255/70R18 (−1.54%)
• 255/70R18 vs 275/65R18 (+0.06%)
• 255/70R18 vs 265/70R18 (+1.72%)
• 255/70R18 vs 33x12.50R18 (+2.95%)
• 255/70R18 vs 275/70R18 (+3.44%)
• 255/70R18 vs 275/55R20 (−0.45%)
• 255/70R18 vs 305/50R20 (−0.15%)
• 255/70R18 vs 255/60R20 (−0.02%)
• 255/70R18 vs 285/55R20 (+0.90%)
• 255/70R18 vs 265/60R20 (+1.45%)

Sizes within 3% of 32.06 in diameter

• 255/75R17 32.06 in (+0.01%)
• 255/60R20 32.05 in (−0.02%)
• 275/65R18 32.07 in (+0.06%)
• 285/45R22 32.10 in (+0.14%)
• 305/50R20 32.01 in (−0.15%)
• 32x11.50R15 32.00 in (−0.17%)
• 295/35R24 32.13 in (+0.23%)
• 275/70R17 32.16 in (+0.32%)
• 275/55R20 31.91 in (−0.45%)
• 275/50R21 31.83 in (−0.71%)
• 235/80R17 31.80 in (−0.79%)
• 285/55R20 32.34 in (+0.90%)
• 275/45R22 31.74 in (−0.97%)
• 235/85R16 31.73 in (−1.02%)
• 305/35R24 32.41 in (+1.09%)
• 265/75R16 31.65 in (−1.27%)
• 265/70R17 31.61 in (−1.40%)
• 305/40R22 31.61 in (−1.40%)
• 265/60R20 32.52 in (+1.45%)
• 285/65R17 31.59 in (−1.46%)
• 265/65R18 31.56 in (−1.54%)
• 285/65R18 32.59 in (+1.66%)
• 265/70R18 32.61 in (+1.72%)
• 305/65R17 32.61 in (+1.73%)
• 265/55R20 31.48 in (−1.81%)
• 245/75R17 31.47 in (−1.83%)
• 285/60R18 31.46 in (−1.84%)
• 265/50R21 31.43 in (−1.94%)
• 285/70R17 32.71 in (+2.04%)
• 265/45R22 31.39 in (−2.08%)
• 295/55R20 32.78 in (+2.25%)
• 305/45R22 32.81 in (+2.35%)
• 305/70R16 32.81 in (+2.36%)
• 295/40R22 31.29 in (−2.38%)
• 285/75R16 32.83 in (+2.42%)
• 285/50R20 31.22 in (−2.60%)
• 305/30R24 31.20 in (−2.65%)
• 275/60R20 32.99 in (+2.92%)
• 33x12.50R17 33.00 in (+2.95%)
• 33x12.50R22 33.00 in (+2.95%)
• 33x12.50R15 33.00 in (+2.95%)
• 33x12.50R16 33.00 in (+2.95%)
• 33x12.50R18 33.00 in (+2.95%)
• 33x12.50R20 33.00 in (+2.95%)
• 285/45R21 31.10 in (−2.98%)

Open 255/70R18 in the tire size calculator

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