205/40R18 tire size
A 205/40R18 tire is 24.46 in (621.2 mm) tall and 8.07 in (205.0 mm) wide, and turns 825 revolutions per mile.
- 24.46 inOverall diameter
- 3.23 inSidewall height
- 825Revolutions per mile
- 24.5x8.1R18Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 24.46 in | 621.2 mm |
| Section width | 8.07 in | 205.0 mm |
| Sidewall height | 3.23 in | 82.0 mm |
| Rim diameter | 18.00 in | 457.2 mm |
| Circumference | 76.83 in | 1,952 mm |
| Revolutions per mile | 825 | |
| Flotation equivalent | 24.5x8.1R18 (approx.) | |
205/40R18 is a 18-inch tire with a 205 mm (8.07 in) section width and a 40% aspect ratio, giving a 3.23-inch sidewall and a flotation-style size of about 24.5x8.1R18.
Its overall diameter is 24.46 inches, so it rolls 76.8 inches per revolution and turns about 825 times per mile.
39 other sizes in this list are within 3% of that diameter.
Compare 205/40R18 with plausible swaps
- 205/50R16 vs 205/40R18 (−1.58%)
- 195/55R16 vs 205/40R18 (−0.05%)
- 185/60R16 vs 205/40R18 (+1.16%)
- 225/50R16 vs 205/40R18 (+1.64%)
- 225/40R17 vs 205/40R18 (−1.51%)
- 205/45R17 vs 205/40R18 (−0.79%)
- 235/40R17 vs 205/40R18 (−0.23%)
- 215/45R17 vs 205/40R18 (+0.66%)
- 245/40R17 vs 205/40R18 (+1.06%)
- 215/35R18 vs 205/40R18 (−2.17%)
- 225/35R18 vs 205/40R18 (−1.05%)
- 205/40R18 vs 235/35R18 (+0.08%)
- 205/40R18 vs 245/35R18 (+1.21%)
- 205/40R18 vs 215/40R18 (+1.29%)
- 205/40R18 vs 225/40R18 (+2.58%)
- 205/40R18 vs 245/30R19 (+1.35%)
Sizes within 3% of 24.46 in diameter
- 185/65R15 24.47 in (+0.05%)
- 195/55R16 24.44 in (−0.05%)
- 235/35R18 24.48 in (+0.08%)
- 235/40R17 24.40 in (−0.23%)
- 215/45R17 24.62 in (+0.66%)
- 205/45R17 24.26 in (−0.79%)
- 205/60R15 24.69 in (+0.93%)
- 195/60R15 24.21 in (−1.00%)
- 225/35R18 24.20 in (−1.05%)
- 245/40R17 24.72 in (+1.06%)
- 185/70R14 24.20 in (−1.06%)
- 185/60R16 24.74 in (+1.16%)
- 195/70R14 24.75 in (+1.19%)
- 245/35R18 24.75 in (+1.21%)
- 215/40R18 24.77 in (+1.29%)
- 245/30R19 24.79 in (+1.35%)
- 225/40R17 24.09 in (−1.51%)
- 205/50R16 24.07 in (−1.58%)
- 225/50R16 24.86 in (+1.64%)
- 205/55R16 24.88 in (+1.72%)
- 175/80R13 24.02 in (−1.77%)
- 185/55R16 24.01 in (−1.82%)
- 195/65R14 23.98 in (−1.95%)
- 175/65R15 23.96 in (−2.04%)
- 225/45R17 24.97 in (+2.11%)
- 195/65R15 24.98 in (+2.14%)
- 215/35R18 23.93 in (−2.17%)
- 195/45R17 23.91 in (−2.24%)
- 255/30R19 25.02 in (+2.32%)
- 255/35R18 25.03 in (+2.33%)
- 255/40R17 25.03 in (+2.35%)
- 205/55R15 23.88 in (−2.37%)
- 225/50R15 23.86 in (−2.45%)
- 205/50R17 25.07 in (+2.51%)
- 225/40R18 25.09 in (+2.58%)
- 215/40R17 23.77 in (−2.80%)
- 155/80R14 23.76 in (−2.83%)
- 215/60R15 25.16 in (+2.87%)
- 185/60R15 23.74 in (−2.93%)
Open 205/40R18 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.