285/40R18 tire size
A 285/40R18 tire is 26.98 in (685.2 mm) tall and 11.22 in (285.0 mm) wide, and turns 748 revolutions per mile.
- 26.98 inOverall diameter
- 4.49 inSidewall height
- 748Revolutions per mile
- 27.0x11.2R18Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 26.98 in | 685.2 mm |
| Section width | 11.22 in | 285.0 mm |
| Sidewall height | 4.49 in | 114.0 mm |
| Rim diameter | 18.00 in | 457.2 mm |
| Circumference | 84.75 in | 2,153 mm |
| Revolutions per mile | 748 | |
| Flotation equivalent | 27.0x11.2R18 (approx.) | |
285/40R18 is a 18-inch tire with a 285 mm (11.22 in) section width and a 40% aspect ratio, giving a 4.49-inch sidewall and a flotation-style size of about 27.0x11.2R18.
Its overall diameter is 26.98 inches, so it rolls 84.7 inches per revolution and turns about 748 times per mile.
67 other sizes in this list are within 3% of that diameter.
Compare 285/40R18 with plausible swaps
- 215/65R16 vs 285/40R18 (+0.10%)
- 235/60R16 vs 285/40R18 (+0.47%)
- 225/55R17 vs 285/40R18 (−0.86%)
- 255/50R17 vs 285/40R18 (+0.23%)
- 215/60R17 vs 285/40R18 (+0.67%)
- 235/55R17 vs 285/40R18 (+0.74%)
- 285/35R18 vs 285/40R18 (−4.16%)
- 265/40R18 vs 285/40R18 (−2.34%)
- 275/40R18 vs 285/40R18 (−1.17%)
- 225/50R18 vs 285/40R18 (−0.44%)
- 285/40R18 vs 255/45R18 (+0.22%)
- 285/40R18 vs 295/40R18 (+1.17%)
- 285/40R18 vs 285/45R18 (+4.16%)
- 285/40R18 vs 285/35R19 (−0.45%)
- 285/40R18 vs 225/45R19 (−0.01%)
- 285/40R18 vs 255/40R19 (+0.20%)
- 285/40R18 vs 295/35R19 (+0.57%)
- 285/40R18 vs 285/30R20 (−0.90%)
- 285/40R18 vs 245/35R20 (−0.83%)
- 285/40R18 vs 295/30R20 (−0.03%)
- 285/40R18 vs 255/35R20 (+0.19%)
- 285/40R18 vs 225/40R20 (+0.41%)
Sizes within 3% of 26.98 in diameter
- 225/45R19 26.97 in (−0.01%)
- 295/30R20 26.97 in (−0.03%)
- 27x8.50R14 27.00 in (+0.09%)
- 215/65R16 27.00 in (+0.10%)
- 255/35R20 27.03 in (+0.19%)
- 255/40R19 27.03 in (+0.20%)
- 255/45R18 27.04 in (+0.22%)
- 255/50R17 27.04 in (+0.23%)
- 225/40R20 27.09 in (+0.41%)
- 225/50R18 26.86 in (−0.44%)
- 285/35R19 26.85 in (−0.45%)
- 235/60R16 27.10 in (+0.47%)
- 215/70R15 26.85 in (−0.47%)
- 205/75R15 27.11 in (+0.48%)
- 295/35R19 27.13 in (+0.57%)
- 215/60R17 27.16 in (+0.67%)
- 235/55R17 27.18 in (+0.74%)
- 245/35R20 26.75 in (−0.83%)
- 225/55R17 26.74 in (−0.86%)
- 285/30R20 26.73 in (−0.90%)
- 245/40R19 26.72 in (−0.96%)
- 235/50R18 27.25 in (+1.02%)
- 215/75R14 26.70 in (−1.04%)
- 245/45R18 26.68 in (−1.09%)
- 225/75R14 27.29 in (+1.15%)
- 275/40R18 26.66 in (−1.17%)
- 295/40R18 27.29 in (+1.17%)
- 265/35R20 27.30 in (+1.21%)
- 245/50R17 26.65 in (−1.23%)
- 215/55R18 27.31 in (+1.24%)
- 225/60R16 26.63 in (−1.28%)
- 235/45R19 27.33 in (+1.30%)
- 265/40R19 27.35 in (+1.37%)
- 275/35R19 26.58 in (−1.47%)
- 265/45R18 27.39 in (+1.53%)
- 225/70R15 27.40 in (+1.58%)
- 305/35R19 27.41 in (+1.59%)
- 225/65R15 26.52 in (−1.71%)
- 275/30R20 26.50 in (−1.78%)
- 205/65R16 26.49 in (−1.80%)
- 235/35R20 26.48 in (−1.85%)
- 215/50R18 26.46 in (−1.90%)
- 275/30R21 27.50 in (+1.93%)
- 225/65R16 27.52 in (+2.00%)
- 225/70R14 26.40 in (−2.13%)
- 235/40R19 26.40 in (−2.13%)
- 245/60R16 27.57 in (+2.22%)
- 275/35R20 27.58 in (+2.23%)
- 265/40R18 26.35 in (−2.34%)
- 245/55R17 27.61 in (+2.35%)
- 235/45R18 26.33 in (−2.41%)
- 225/60R17 27.63 in (+2.42%)
- 215/55R17 26.31 in (−2.47%)
- 245/50R18 27.65 in (+2.48%)
- 265/35R19 26.30 in (−2.50%)
- 205/70R15 26.30 in (−2.51%)
- 275/40R19 27.66 in (+2.54%)
- 245/45R19 27.68 in (+2.61%)
- 265/30R20 26.26 in (−2.66%)
- 215/75R15 27.70 in (+2.67%)
- 235/50R17 26.25 in (−2.69%)
- 245/40R20 27.72 in (+2.74%)
- 225/55R18 27.74 in (+2.85%)
- 275/45R18 27.74 in (+2.85%)
- 305/30R19 26.20 in (−2.86%)
- 245/35R21 27.75 in (+2.88%)
- 225/35R20 26.20 in (−2.88%)
Open 285/40R18 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.