245/40R18 tire size
A 245/40R18 tire is 25.72 in (653.2 mm) tall and 9.65 in (245.0 mm) wide, and turns 784 revolutions per mile.
- 25.72 inOverall diameter
- 3.86 inSidewall height
- 784Revolutions per mile
- 25.7x9.6R18Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 25.72 in | 653.2 mm |
| Section width | 9.65 in | 245.0 mm |
| Sidewall height | 3.86 in | 98.0 mm |
| Rim diameter | 18.00 in | 457.2 mm |
| Circumference | 80.79 in | 2,052 mm |
| Revolutions per mile | 784 | |
| Flotation equivalent | 25.7x9.6R18 (approx.) | |
245/40R18 is a 18-inch tire with a 245 mm (9.65 in) section width and a 40% aspect ratio, giving a 3.86-inch sidewall and a flotation-style size of about 25.7x9.6R18.
Its overall diameter is 25.72 inches, so it rolls 80.8 inches per revolution and turns about 784 times per mile.
62 other sizes in this list are within 3% of that diameter.
Compare 245/40R18 with plausible swaps
- 205/60R16 vs 245/40R18 (−0.12%)
- 225/55R16 vs 245/40R18 (+0.11%)
- 275/40R17 vs 245/40R18 (−0.21%)
- 245/45R17 vs 245/40R18 (−0.14%)
- 225/50R17 vs 245/40R18 (+0.55%)
- 205/55R17 vs 245/40R18 (+0.63%)
- 245/35R18 vs 245/40R18 (−3.75%)
- 225/40R18 vs 245/40R18 (−2.45%)
- 235/40R18 vs 245/40R18 (−1.22%)
- 275/35R18 vs 245/40R18 (−0.54%)
- 215/45R18 vs 245/40R18 (−0.38%)
- 245/40R18 vs 285/35R18 (+0.54%)
- 245/40R18 vs 255/40R18 (+1.22%)
- 245/40R18 vs 265/40R18 (+2.45%)
- 245/40R18 vs 245/45R18 (+3.75%)
- 245/40R18 vs 235/35R19 (−0.93%)
- 245/40R18 vs 275/30R19 (−0.86%)
- 245/40R18 vs 285/30R19 (+0.06%)
- 245/40R18 vs 245/35R19 (+0.14%)
- 245/40R18 vs 295/30R19 (+0.98%)
- 245/40R18 vs 225/30R20 (−1.56%)
Sizes within 3% of 25.72 in diameter
- 285/30R19 25.73 in (+0.06%)
- 225/55R16 25.74 in (+0.11%)
- 195/70R15 25.75 in (+0.12%)
- 205/60R16 25.69 in (−0.12%)
- 245/35R19 25.75 in (+0.14%)
- 245/45R17 25.68 in (−0.14%)
- 275/40R17 25.66 in (−0.21%)
- 225/60R15 25.63 in (−0.34%)
- 215/45R18 25.62 in (−0.38%)
- 215/70R14 25.85 in (+0.52%)
- 275/35R18 25.58 in (−0.54%)
- 285/35R18 25.85 in (+0.54%)
- 225/50R17 25.86 in (+0.55%)
- 205/55R17 25.88 in (+0.63%)
- 195/75R14 25.52 in (−0.78%)
- 275/30R19 25.50 in (−0.86%)
- 205/65R15 25.49 in (−0.87%)
- 235/35R19 25.48 in (−0.93%)
- 295/30R19 25.97 in (+0.98%)
- 215/50R17 25.46 in (−0.98%)
- 225/45R18 25.97 in (+1.00%)
- 215/65R15 26.00 in (+1.12%)
- 255/30R20 26.02 in (+1.19%)
- 255/35R19 26.03 in (+1.21%)
- 235/40R18 25.40 in (−1.22%)
- 255/40R18 26.03 in (+1.22%)
- 255/45R17 26.04 in (+1.24%)
- 225/40R19 26.09 in (+1.44%)
- 265/40R17 25.35 in (−1.44%)
- 235/60R15 26.10 in (+1.50%)
- 205/75R14 26.11 in (+1.52%)
- 235/45R17 25.33 in (−1.52%)
- 225/30R20 25.31 in (−1.56%)
- 215/55R16 25.31 in (−1.58%)
- 265/35R18 25.30 in (−1.61%)
- 295/35R18 26.13 in (+1.61%)
- 205/70R14 25.30 in (−1.62%)
- 215/60R16 26.16 in (+1.71%)
- 265/30R19 25.26 in (−1.78%)
- 225/35R20 26.20 in (+1.88%)
- 305/30R19 26.20 in (+1.90%)
- 195/60R16 25.21 in (−1.96%)
- 225/35R19 25.20 in (−2.01%)
- 235/50R17 26.25 in (+2.08%)
- 265/30R20 26.26 in (+2.11%)
- 215/60R15 25.16 in (−2.17%)
- 205/70R15 26.30 in (+2.27%)
- 265/35R19 26.30 in (+2.28%)
- 215/55R17 26.31 in (+2.31%)
- 235/45R18 26.33 in (+2.37%)
- 225/40R18 25.09 in (−2.45%)
- 265/40R18 26.35 in (+2.45%)
- 205/50R17 25.07 in (−2.51%)
- 225/70R14 26.40 in (+2.66%)
- 235/40R19 26.40 in (+2.66%)
- 255/40R17 25.03 in (−2.66%)
- 255/35R18 25.03 in (−2.68%)
- 255/30R19 25.02 in (−2.69%)
- 195/65R15 24.98 in (−2.86%)
- 225/45R17 24.97 in (−2.89%)
- 215/50R18 26.46 in (+2.91%)
- 235/35R20 26.48 in (+2.95%)
Open 245/40R18 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.