245/55R18 tire size

A 245/55R18 tire is 28.61 in (726.7 mm) tall and 9.65 in (245.0 mm) wide, and turns 705 revolutions per mile.

• 28.61 inOverall diameter
• 5.31 inSidewall height
• 705Revolutions per mile
• 28.6x9.6R18Flotation equivalent

245/55R18 is a 18-inch tire with a 245 mm (9.65 in) section width and a 55% aspect ratio, giving a 5.31-inch sidewall and a flotation-style size of about 28.6x9.6R18.

Its overall diameter is 28.61 inches, so it rolls 89.9 inches per revolution and turns about 705 times per mile.

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

Compare 245/55R18 with plausible swaps

• 225/70R16 vs 245/55R18 (−0.73%)
• 245/65R16 vs 245/55R18 (−0.25%)
• 215/75R16 vs 245/55R18 (+0.30%)
• 235/70R16 vs 245/55R18 (+1.20%)
• 255/65R16 vs 245/55R18 (+1.54%)
• 225/65R17 vs 245/55R18 (−0.33%)
• 245/60R17 vs 245/55R18 (−0.12%)
• 245/50R18 vs 245/55R18 (−3.37%)
• 225/55R18 vs 245/55R18 (−3.03%)
• 235/55R18 vs 245/55R18 (−1.51%)
• 265/50R18 vs 245/55R18 (−0.62%)
• 245/55R18 vs 225/60R18 (+0.07%)
• 245/55R18 vs 255/55R18 (+1.51%)
• 245/55R18 vs 245/60R18 (+3.37%)
• 245/55R18 vs 265/45R19 (−0.77%)
• 245/55R18 vs 245/50R19 (+0.12%)
• 245/55R18 vs 225/55R19 (+0.47%)
• 245/55R18 vs 275/45R19 (+0.47%)
• 245/55R18 vs 235/45R20 (−0.99%)
• 245/55R18 vs 265/40R20 (−0.92%)
• 245/55R18 vs 275/40R20 (+0.18%)
• 245/55R18 vs 245/45R20 (+0.25%)
• 245/55R18 vs 315/35R20 (+0.25%)

Sizes within 3% of 28.61 in diameter

• 225/60R18 28.63 in (+0.07%)
• 275/35R21 28.58 in (−0.11%)
• 245/50R19 28.65 in (+0.12%)
• 245/60R17 28.57 in (−0.12%)
• 275/40R20 28.66 in (+0.18%)
• 325/30R21 28.68 in (+0.23%)
• 245/45R20 28.68 in (+0.25%)
• 315/35R20 28.68 in (+0.25%)
• 245/65R16 28.54 in (−0.25%)
• 215/75R16 28.70 in (+0.30%)
• 225/65R17 28.52 in (−0.33%)
• 245/40R21 28.72 in (+0.37%)
• 275/30R22 28.50 in (−0.40%)
• 285/30R22 28.73 in (+0.43%)
• 225/55R19 28.74 in (+0.47%)
• 275/45R19 28.74 in (+0.47%)
• 245/35R22 28.75 in (+0.50%)
• 265/50R18 28.43 in (−0.62%)
• 225/70R16 28.40 in (−0.73%)
• 265/45R19 28.39 in (−0.77%)
• 285/35R21 28.85 in (+0.85%)
• 265/40R20 28.35 in (−0.92%)
• 235/75R15 28.88 in (+0.94%)
• 235/45R20 28.33 in (−0.99%)
• 265/35R21 28.30 in (−1.07%)
• 295/40R19 28.29 in (−1.11%)
• 225/75R15 28.29 in (−1.13%)
• 235/70R16 28.95 in (+1.20%)
• 265/30R22 28.26 in (−1.22%)
• 295/30R22 28.97 in (+1.25%)
• 235/50R19 28.25 in (−1.25%)
• 285/40R20 28.98 in (+1.28%)
• 305/30R21 28.20 in (−1.42%)
• 235/65R17 29.03 in (+1.46%)
• 255/35R22 29.03 in (+1.46%)
• 255/40R21 29.03 in (+1.47%)
• 255/45R20 29.04 in (+1.49%)
• 255/50R19 29.04 in (+1.50%)
• 235/55R18 28.18 in (−1.51%)
• 255/55R18 29.04 in (+1.51%)
• 255/60R17 29.05 in (+1.53%)
• 255/65R16 29.05 in (+1.54%)
• 255/70R15 29.06 in (+1.55%)
• 295/35R20 28.13 in (−1.68%)
• 285/45R19 29.10 in (+1.71%)
• 235/60R18 29.10 in (+1.72%)
• 205/75R16 28.11 in (−1.76%)
• 235/60R17 28.10 in (−1.78%)
• 285/45R18 28.10 in (−1.79%)
• 295/35R21 29.13 in (+1.82%)
• 235/55R19 29.18 in (+1.98%)
• 255/50R18 28.04 in (−2.00%)
• 255/45R19 28.04 in (−2.01%)
• 255/40R20 28.03 in (−2.02%)
• 235/65R16 28.03 in (−2.04%)
• 255/35R21 28.03 in (−2.04%)
• 255/30R22 28.02 in (−2.05%)
• 215/65R17 28.00 in (−2.12%)
• 285/40R19 27.98 in (−2.22%)
• 295/30R21 27.97 in (−2.24%)
• 235/70R15 27.95 in (−2.30%)
• 225/75R16 29.29 in (+2.37%)
• 295/40R20 29.29 in (+2.38%)
• 265/35R22 29.30 in (+2.42%)
• 235/45R21 29.33 in (+2.50%)
• 265/40R21 29.35 in (+2.57%)
• 225/50R19 27.86 in (−2.63%)
• 285/35R20 27.85 in (−2.64%)
• 215/70R16 27.85 in (−2.66%)
• 265/45R20 29.39 in (+2.72%)
• 275/25R24 29.41 in (+2.81%)
• 295/25R22 27.81 in (−2.81%)
• 265/50R19 29.43 in (+2.88%)
• 245/30R22 27.79 in (−2.88%)
• 315/30R22 29.44 in (+2.90%)
• 245/75R15 29.47 in (+3.00%)
• 245/35R21 27.75 in (−3.00%)

Open 245/55R18 in the tire size calculator

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