Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 245/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 26.79 (680.4) | -0.71 (-18) -2.6% |
| Width inches (mm) | 10.83 (275) | 9.65 (245) | -1.18 (-30) -10.9% |
| Circum. inches (mm) | 86.38 (2194.09) | 84.16 (2137.54) | -2.23 (-56.55) -2.6% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 2.89 (73.5) | -0.35 (-9) -10.9% |
| Revolutions per mile (km) | 733.49 (455.77) | 752.9 (467.83) | 19.4 (12.06) 2.6% |
245/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.48 mph (31.36 km/h) |
| 25 mph (40.23 km/h) | 24.36 mph (39.2 km/h) |
| 30 mph (48.28 km/h) | 29.23 mph (47.04 km/h) |
| 35 mph (56.33 km/h) | 34.1 mph (54.88 km/h) |
| 40 mph (64.37 km/h) | 38.97 mph (62.71 km/h) |
| 45 mph (72.42 km/h) | 43.84 mph (70.55 km/h) |
| 50 mph (80.47 km/h) | 48.71 mph (78.39 km/h) |
| 55 mph (88.51 km/h) | 53.58 mph (86.23 km/h) |
| 60 mph (96.56 km/h) | 58.45 mph (94.07 km/h) |
| 65 mph (104.61 km/h) | 63.32 mph (101.91 km/h) |
| 70 mph (112.65 km/h) | 68.2 mph (109.75 km/h) |
| 75 mph (120.7 km/h) | 73.07 mph (117.59 km/h) |
| 80 mph (128.75 km/h) | 77.94 mph (125.43 km/h) |
| 85 mph (136.79 km/h) | 82.81 mph (133.27 km/h) |
| 90 mph (144.84 km/h) | 87.68 mph (141.11 km/h) |
| 95 mph (152.89 km/h) | 92.55 mph (148.95 km/h) |
| 100 mph (160.93 km/h) | 97.42 mph (156.79 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1916 | 2226 | 2397 | 2503 | 2617 | 2699 | 2788 | 2894 | 3041 | 3188 | 3351 | 3481 | 3718 | 3979 | 4183 | 4313 | 4386 | 4655 | 5030 | 5846 |
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