255/40R21 Tires
255/40R21 Conversion
When converted to inches, 255/40R21 is equivalent to 29x10R21.
255/40R21 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 4 inches (102 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 29 inches (737 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 91.1 inches (2314.2 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. 255/40R21 tire makes 695 revolutions per mile (432 revolutions per kilometer).
| Metric | Inches | |
|---|---|---|
| Overall Diameter (Tire Height) | 737 mm | 29" |
| Tread Width | 255 mm | 10" |
| Rim Diameter | 533.4 mm | 21" |
| Sidewall Height | 102 mm | 4" |
| Circumference | 2314.2 mm | 91.1" |
| Revolutions | 432 per km | 695 per mile |
| Best Prices on 255/40R21 Tires | |
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 from $312.74 |
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 from $430.99 |
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 from $229.99 |
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 from $218.96 |
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255/40R21 Replacement Tire Sizes
Replacement tires have to be within 3% of the original tire's overall diameter. 255/40R21 tire can be replaced with 30 compatible tire sizes. Select optional plus size to see its specs.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 265/25R23 | 28.2" (716 mm) | -2.8% |
| 305/30R21 | 28.2" (717 mm) | -2.7% |
| 315/25R22 | 28.2" (717 mm) | -2.7% |
| 265/35R21 | 28.3" (719 mm) | -2.4% |
| 265/30R22 | 28.3" (719 mm) | -2.4% |
| 315/30R21 | 28.5" (723 mm) | -1.9% |
| 275/35R21 | 28.5" (725 mm) | -1.6% |
| 275/30R22 | 28.5" (725 mm) | -1.6% |
| 335/25R22 | 28.6" (727 mm) | -1.4% |
| 325/30R21 | 28.7" (729 mm) | -1.1% |
| 245/40R21 | 28.7" (729 mm) | -1.1% |
| 245/35R22 | 28.8" (731 mm) | -0.8% |
| 285/30R22 | 28.8" (731 mm) | -0.8% |
| 285/35R21 | 28.9" (733 mm) | -0.5% |
| 305/25R23 | 29" (736 mm) | -0.1% |
| 255/35R22 | 29" (737 mm) | 0% |
| 295/30R22 | 29" (737 mm) | 0% |
| 295/35R21 | 29.1" (739 mm) | 0.3% |
| 315/25R23 | 29.2" (742 mm) | 0.7% |
| 305/30R22 | 29.3" (743 mm) | 0.8% |
| 235/45R21 | 29.3" (745 mm) | 1.1% |
| 265/40R21 | 29.3" (745 mm) | 1.1% |
| 265/35R22 | 29.3" (745 mm) | 1.1% |
| 305/35R21 | 29.4" (747 mm) | 1.4% |
| 315/30R22 | 29.5" (749 mm) | 1.6% |
| 275/35R22 | 29.6" (751 mm) | 1.9% |
| 315/35R21 | 29.6" (753 mm) | 2.2% |
| 245/45R21 | 29.6" (753 mm) | 2.2% |
| 275/40R21 | 29.6" (753 mm) | 2.2% |
| 285/35R22 | 29.9" (759 mm) | 3% |