225/40R18 tire size
A 225/40R18 tire is 25.09 in (637.2 mm) tall and 8.86 in (225.0 mm) wide, and turns 804 revolutions per mile.
- 25.09 inOverall diameter
- 3.54 inSidewall height
- 804Revolutions per mile
- 25.1x8.9R18Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 25.09 in | 637.2 mm |
| Section width | 8.86 in | 225.0 mm |
| Sidewall height | 3.54 in | 90.0 mm |
| Rim diameter | 18.00 in | 457.2 mm |
| Circumference | 78.81 in | 2,002 mm |
| Revolutions per mile | 804 | |
| Flotation equivalent | 25.1x8.9R18 (approx.) | |
225/40R18 is a 18-inch tire with a 225 mm (8.86 in) section width and a 40% aspect ratio, giving a 3.54-inch sidewall and a flotation-style size of about 25.1x8.9R18.
Its overall diameter is 25.09 inches, so it rolls 78.8 inches per revolution and turns about 804 times per mile.
48 other sizes in this list are within 3% of that diameter.
Compare 225/40R18 with plausible swaps
- 225/50R16 vs 225/40R18 (−0.91%)
- 205/55R16 vs 225/40R18 (−0.83%)
- 195/60R16 vs 225/40R18 (+0.50%)
- 215/55R16 vs 225/40R18 (+0.89%)
- 225/45R17 vs 225/40R18 (−0.46%)
- 255/40R17 vs 225/40R18 (−0.22%)
- 205/50R17 vs 225/40R18 (−0.06%)
- 235/45R17 vs 225/40R18 (+0.96%)
- 265/40R17 vs 225/40R18 (+1.04%)
- 225/35R18 vs 225/40R18 (−3.53%)
- 205/40R18 vs 225/40R18 (−2.51%)
- 215/40R18 vs 225/40R18 (−1.26%)
- 255/35R18 vs 225/40R18 (−0.24%)
- 225/40R18 vs 265/35R18 (+0.86%)
- 225/40R18 vs 235/40R18 (+1.26%)
- 225/40R18 vs 245/40R18 (+2.51%)
- 225/40R18 vs 225/45R18 (+3.53%)
- 225/40R18 vs 245/30R19 (−1.19%)
- 225/40R18 vs 255/30R19 (−0.25%)
- 225/40R18 vs 225/35R19 (+0.46%)
- 225/40R18 vs 265/30R19 (+0.69%)
- 225/40R18 vs 225/30R20 (+0.91%)
Sizes within 3% of 25.09 in diameter
- 205/50R17 25.07 in (−0.06%)
- 255/40R17 25.03 in (−0.22%)
- 255/35R18 25.03 in (−0.24%)
- 255/30R19 25.02 in (−0.25%)
- 215/60R15 25.16 in (+0.28%)
- 195/65R15 24.98 in (−0.42%)
- 225/35R19 25.20 in (+0.46%)
- 225/45R17 24.97 in (−0.46%)
- 195/60R16 25.21 in (+0.50%)
- 265/30R19 25.26 in (+0.69%)
- 205/55R16 24.88 in (−0.83%)
- 205/70R14 25.30 in (+0.85%)
- 265/35R18 25.30 in (+0.86%)
- 215/55R16 25.31 in (+0.89%)
- 225/30R20 25.31 in (+0.91%)
- 225/50R16 24.86 in (−0.91%)
- 235/45R17 25.33 in (+0.96%)
- 265/40R17 25.35 in (+1.04%)
- 245/30R19 24.79 in (−1.19%)
- 215/40R18 24.77 in (−1.26%)
- 235/40R18 25.40 in (+1.26%)
- 245/35R18 24.75 in (−1.33%)
- 195/70R14 24.75 in (−1.35%)
- 185/60R16 24.74 in (−1.38%)
- 245/40R17 24.72 in (−1.48%)
- 215/50R17 25.46 in (+1.51%)
- 235/35R19 25.48 in (+1.55%)
- 205/60R15 24.69 in (−1.60%)
- 205/65R15 25.49 in (+1.62%)
- 275/30R19 25.50 in (+1.63%)
- 195/75R14 25.52 in (+1.71%)
- 215/45R17 24.62 in (−1.87%)
- 275/35R18 25.58 in (+1.96%)
- 215/45R18 25.62 in (+2.12%)
- 225/60R15 25.63 in (+2.17%)
- 275/40R17 25.66 in (+2.29%)
- 245/45R17 25.68 in (+2.37%)
- 205/60R16 25.69 in (+2.39%)
- 235/35R18 24.48 in (−2.43%)
- 185/65R15 24.47 in (−2.46%)
- 205/40R18 24.46 in (−2.51%)
- 245/40R18 25.72 in (+2.51%)
- 195/55R16 24.44 in (−2.56%)
- 285/30R19 25.73 in (+2.57%)
- 225/55R16 25.74 in (+2.62%)
- 195/70R15 25.75 in (+2.64%)
- 245/35R19 25.75 in (+2.65%)
- 235/40R17 24.40 in (−2.73%)
Open 225/40R18 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.