285/40R21 Tires
285/40R21 Conversion
When converted to inches, 285/40R21 is equivalent to 30x11.2R21.
285/40R21 tire has a section width of 11.2 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 21 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 4.5 inches (114 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 30 inches (761 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 94.2 inches (2389.5 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. 285/40R21 tire makes 673 revolutions per mile (418 revolutions per kilometer).
| Metric | Inches | |
|---|---|---|
| Overall Diameter (Tire Height) | 761 mm | 30" |
| Tread Width | 285 mm | 11.2" |
| Rim Diameter | 533.4 mm | 21" |
| Sidewall Height | 114 mm | 4.5" |
| Circumference | 2389.5 mm | 94.2" |
| Revolutions | 418 per km | 673 per mile |
| Best Prices on 285/40R21 Tires | |
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 from $381.91 |
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 from $426.99 |
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 from $347.99 |
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285/40R21 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 285/40R21 tire can be replaced with 25 compatible tire sizes. Select optional plus size to see its specs.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 295/35R21 | 29.1" (739 mm) | -2.9% |
| 315/25R23 | 29.2" (742 mm) | -2.5% |
| 305/30R22 | 29.3" (743 mm) | -2.4% |
| 235/45R21 | 29.3" (745 mm) | -2.1% |
| 265/35R22 | 29.3" (745 mm) | -2.1% |
| 265/40R21 | 29.3" (745 mm) | -2.1% |
| 305/35R21 | 29.4" (747 mm) | -1.8% |
| 315/30R22 | 29.5" (749 mm) | -1.6% |
| 275/35R22 | 29.6" (751 mm) | -1.3% |
| 245/45R21 | 29.6" (753 mm) | -1.1% |
| 275/40R21 | 29.6" (753 mm) | -1.1% |
| 315/35R21 | 29.6" (753 mm) | -1.1% |
| 285/35R22 | 29.9" (759 mm) | -0.3% |
| 295/30R23 | 30" (762 mm) | 0.1% |
| 255/40R22 | 30" (763 mm) | 0.3% |
| 255/45R21 | 30" (763 mm) | 0.3% |
| 295/35R22 | 30.1" (765 mm) | 0.5% |
| 295/40R21 | 30.3" (769 mm) | 1.1% |
| 265/45R21 | 30.4" (771 mm) | 1.3% |
| 265/40R22 | 30.4" (771 mm) | 1.3% |
| 305/35R22 | 30.4" (773 mm) | 1.6% |
| 275/40R22 | 30.7" (779 mm) | 2.4% |
| 315/35R22 | 30.7" (779 mm) | 2.4% |
| 325/30R23 | 30.7" (780 mm) | 2.5% |
| 275/45R21 | 30.7" (781 mm) | 2.6% |