Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 275/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 27.5 (698.4) | 0.1 (2.5) 0.4% |
| Width inches (mm) | 12.8 (325) | 10.83 (275) | -1.97 (-50) -15.4% |
| Circum. inches (mm) | 86.07 (2186.23) | 86.38 (2194.09) | 0.31 (7.85) 0.4% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 3.25 (82.5) | 0.05 (1.25) 1.5% |
| Revolutions per mile (km) | 736.13 (457.41) | 733.49 (455.77) | -2.64 (-1.64) -0.4% |
275/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.07 mph (32.3 km/h) |
| 25 mph (40.23 km/h) | 25.09 mph (40.38 km/h) |
| 30 mph (48.28 km/h) | 30.11 mph (48.45 km/h) |
| 35 mph (56.33 km/h) | 35.13 mph (56.53 km/h) |
| 40 mph (64.37 km/h) | 40.14 mph (64.61 km/h) |
| 45 mph (72.42 km/h) | 45.16 mph (72.68 km/h) |
| 50 mph (80.47 km/h) | 50.18 mph (80.76 km/h) |
| 55 mph (88.51 km/h) | 55.2 mph (88.83 km/h) |
| 60 mph (96.56 km/h) | 60.22 mph (96.91 km/h) |
| 65 mph (104.61 km/h) | 65.23 mph (104.98 km/h) |
| 70 mph (112.65 km/h) | 70.25 mph (113.06 km/h) |
| 75 mph (120.7 km/h) | 75.27 mph (121.13 km/h) |
| 80 mph (128.75 km/h) | 80.29 mph (129.21 km/h) |
| 85 mph (136.79 km/h) | 85.31 mph (137.29 km/h) |
| 90 mph (144.84 km/h) | 90.32 mph (145.36 km/h) |
| 95 mph (152.89 km/h) | 95.34 mph (153.44 km/h) |
| 100 mph (160.93 km/h) | 100.36 mph (161.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1867 | 2168 | 2335 | 2438 | 2550 | 2629 | 2716 | 2820 | 2963 | 3106 | 3265 | 3392 | 3622 | 3876 | 4075 | 4202 | 4273 | 4535 | 4901 | 5695 |
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