225/40R18 Tires
225/40R18 Conversion
When converted to inches, 225/40R18 is equivalent to 25.1x8.9R18.
225/40R18 tire has a section width of 8.9 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 18 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 3.5 inches (90 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 25.1 inches (637 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 78.8 inches (2000.2 mm) is the outer perimeter of the tire. Tire revolutions indicate the number of times a tire revolves while it covers the distance in miles or kilometers. 225/40R18 tire makes 804 revolutions per mile (500 revolutions per kilometer).
| Metric | Inches | |
|---|---|---|
| Overall Diameter (Tire Height) | 637 mm | 25.1" |
| Tread Width | 225 mm | 8.9" |
| Rim Diameter | 457.2 mm | 18" |
| Sidewall Height | 90 mm | 3.5" |
| Circumference | 2000.2 mm | 78.8" |
| Revolutions | 500 per km | 804 per mile |
| Best Prices on 225/40R18 Tires | |
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 from $105.00 |
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 from $105.00 |
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 from $79.93 |
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 from $79.96 |
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225/40R18 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 225/40R18 tire can be replaced with 45 compatible tire sizes. Select optional plus size to see its specs.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 135/60R18 | 24.4" (619 mm) | -2.8% |
| 225/30R19 | 24.4" (619 mm) | -2.8% |
| 235/35R18 | 24.4" (621 mm) | -2.5% |
| 205/40R18 | 24.4" (621 mm) | -2.5% |
| 235/30R19 | 24.6" (625 mm) | -1.9% |
| 245/35R18 | 24.8" (629 mm) | -1.3% |
| 285/30R18 | 24.8" (629 mm) | -1.3% |
| 215/40R18 | 24.8" (629 mm) | -1.3% |
| 295/25R19 | 24.8" (631 mm) | -0.9% |
| 245/30R19 | 24.8" (631 mm) | -0.9% |
| 215/35R19 | 24.9" (633 mm) | -0.6% |
| 125/70R18 | 24.9" (633 mm) | -0.6% |
| 305/25R19 | 25" (635 mm) | -0.3% |
| 255/35R18 | 25" (635 mm) | -0.3% |
| 295/30R18 | 25" (635 mm) | -0.3% |
| 255/30R19 | 25.1" (637 mm) | 0% |
| 215/30R20 | 25.1" (638 mm) | 0.2% |
| 225/35R19 | 25.2" (641 mm) | 0.6% |
| 305/30R18 | 25.2" (641 mm) | 0.6% |
| 205/45R18 | 25.2" (641 mm) | 0.6% |
| 315/25R19 | 25.2" (641 mm) | 0.6% |
| 265/35R18 | 25.3" (643 mm) | 0.9% |
| 265/30R19 | 25.3" (643 mm) | 0.9% |
| 155/60R18 | 25.3" (643 mm) | 0.9% |
| 225/30R20 | 25.4" (644 mm) | 1.1% |
| 115/70R19 | 25.4" (645 mm) | 1.3% |
| 135/60R19 | 25.4" (645 mm) | 1.3% |
| 145/65R18 | 25.4" (645 mm) | 1.3% |
| 235/40R18 | 25.4" (645 mm) | 1.3% |
| 275/25R20 | 25.4" (646 mm) | 1.4% |
| 235/35R19 | 25.5" (647 mm) | 1.6% |
| 315/30R18 | 25.5" (647 mm) | 1.6% |
| 135/70R18 | 25.5" (647 mm) | 1.6% |
| 275/30R19 | 25.6" (649 mm) | 1.9% |
| 275/35R18 | 25.6" (649 mm) | 1.9% |
| 235/30R20 | 25.6" (650 mm) | 2% |
| 285/25R20 | 25.6" (650 mm) | 2% |
| 335/25R19 | 25.6" (651 mm) | 2.2% |
| 215/45R18 | 25.6" (651 mm) | 2.2% |
| 245/40R18 | 25.7" (653 mm) | 2.5% |
| 215/40R19 | 25.8" (655 mm) | 2.8% |
| 285/30R19 | 25.8" (655 mm) | 2.8% |
| 245/35R19 | 25.8" (655 mm) | 2.8% |
| 295/25R20 | 25.8" (656 mm) | 3% |
| 245/30R20 | 25.8" (656 mm) | 3% |