305/30R21 Tires
305/30R21 Conversion
When converted to inches, 305/30R21 is equivalent to 28.2x12R21.
305/30R21 tire has a section width of 12 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 3.6 inches (92 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 28.2 inches (717 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 88.5 inches (2251.4 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. 305/30R21 tire makes 716 revolutions per mile (444 revolutions per kilometer).
| Metric | Inches | |
|---|---|---|
| Overall Diameter (Tire Height) | 717 mm | 28.2" |
| Tread Width | 305 mm | 12" |
| Rim Diameter | 533.4 mm | 21" |
| Sidewall Height | 92 mm | 3.6" |
| Circumference | 2251.4 mm | 88.5" |
| Revolutions | 444 per km | 716 per mile |
| Best Prices on 305/30R21 Tires | |
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 from $204.91 |
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 from $351.99 |
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 from $388.99 |
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305/30R21 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 305/30R21 tire can be replaced with 31 compatible tire sizes. Select optional plus size to see its specs.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 275/25R22 | 27.4" (697 mm) | -2.8% |
| 235/35R21 | 27.4" (697 mm) | -2.8% |
| 275/30R21 | 27.5" (699 mm) | -2.5% |
| 285/25R22 | 27.6" (701 mm) | -2.2% |
| 235/30R22 | 27.6" (701 mm) | -2.2% |
| 285/30R21 | 27.8" (705 mm) | -1.7% |
| 245/35R21 | 27.8" (705 mm) | -1.7% |
| 245/30R22 | 27.8" (707 mm) | -1.4% |
| 295/25R22 | 27.8" (707 mm) | -1.4% |
| 295/30R21 | 28" (711 mm) | -0.8% |
| 305/25R22 | 28" (711 mm) | -0.8% |
| 355/25R21 | 28" (711 mm) | -0.8% |
| 255/35R21 | 28" (711 mm) | -0.8% |
| 255/30R22 | 28.1" (713 mm) | -0.6% |
| 265/25R23 | 28.2" (716 mm) | -0.1% |
| 315/25R22 | 28.2" (717 mm) | 0% |
| 265/35R21 | 28.3" (719 mm) | 0.3% |
| 265/30R22 | 28.3" (719 mm) | 0.3% |
| 315/30R21 | 28.5" (723 mm) | 0.8% |
| 275/30R22 | 28.5" (725 mm) | 1.1% |
| 275/35R21 | 28.5" (725 mm) | 1.1% |
| 335/25R22 | 28.6" (727 mm) | 1.4% |
| 325/30R21 | 28.7" (729 mm) | 1.7% |
| 245/40R21 | 28.7" (729 mm) | 1.7% |
| 245/35R22 | 28.8" (731 mm) | 2% |
| 285/30R22 | 28.8" (731 mm) | 2% |
| 285/35R21 | 28.9" (733 mm) | 2.2% |
| 305/25R23 | 29" (736 mm) | 2.6% |
| 295/30R22 | 29" (737 mm) | 2.8% |
| 255/40R21 | 29" (737 mm) | 2.8% |
| 255/35R22 | 29" (737 mm) | 2.8% |