255/30R21 Tires
255/30R21 Conversion
When converted to inches, 255/30R21 is equivalent to 27x10R21.
255/30R21 tire has a section width of 10 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 inches (77 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 27 inches (687 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 84.8 inches (2157.2 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. 255/30R21 tire makes 747 revolutions per mile (464 revolutions per kilometer).
| Metric | Inches | |
|---|---|---|
| Overall Diameter (Tire Height) | 687 mm | 27" |
| Tread Width | 255 mm | 10" |
| Rim Diameter | 533.4 mm | 21" |
| Sidewall Height | 77 mm | 3" |
| Circumference | 2157.2 mm | 84.8" |
| Revolutions | 464 per km | 747 per mile |
| Best Prices on 255/30R21 Tires | |
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 from $288.00 |
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 from $288.00 |
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 from $132.99 |
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 from $150.96 |
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255/30R21 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 255/30R21 tire can be replaced with 19 compatible tire sizes. Select optional plus size to see its specs.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 275/25R21 | 26.4" (671 mm) | -2.3% |
| 235/30R21 | 26.6" (675 mm) | -1.7% |
| 295/25R21 | 26.8" (681 mm) | -0.9% |
| 245/30R21 | 26.8" (681 mm) | -0.9% |
| 375/20R21 | 26.9" (683 mm) | -0.6% |
| 305/25R21 | 27" (685 mm) | -0.3% |
| 265/25R22 | 27.2" (691 mm) | 0.6% |
| 265/30R21 | 27.3" (693 mm) | 0.9% |
| 225/30R22 | 27.4" (695 mm) | 1.2% |
| 325/25R21 | 27.4" (695 mm) | 1.2% |
| 235/35R21 | 27.4" (697 mm) | 1.5% |
| 275/25R22 | 27.4" (697 mm) | 1.5% |
| 275/30R21 | 27.5" (699 mm) | 1.7% |
| 235/30R22 | 27.6" (701 mm) | 2% |
| 285/25R22 | 27.6" (701 mm) | 2% |
| 285/30R21 | 27.8" (705 mm) | 2.6% |
| 245/35R21 | 27.8" (705 mm) | 2.6% |
| 295/25R22 | 27.8" (707 mm) | 2.9% |
| 245/30R22 | 27.8" (707 mm) | 2.9% |