Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/30-21 | 275/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.02 (686.4) | 27.5 (698.4) | 0.47 (12) 1.7% |
| Width inches (mm) | 10.04 (255) | 10.83 (275) | 0.79 (20) 7.8% |
| Circum. inches (mm) | 84.9 (2156.39) | 86.38 (2194.09) | 1.48 (37.7) 1.7% |
| Sidewall Height inches (mm) | 3.01 (76.5) | 3.25 (82.5) | 0.24 (6) 7.8% |
| Revolutions per mile (km) | 746.31 (463.74) | 733.49 (455.77) | -12.82 (-7.97) -1.7% |
275/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.35 mph (32.75 km/h) |
| 25 mph (40.23 km/h) | 25.44 mph (40.94 km/h) |
| 30 mph (48.28 km/h) | 30.52 mph (49.12 km/h) |
| 35 mph (56.33 km/h) | 35.61 mph (57.31 km/h) |
| 40 mph (64.37 km/h) | 40.7 mph (65.5 km/h) |
| 45 mph (72.42 km/h) | 45.79 mph (73.69 km/h) |
| 50 mph (80.47 km/h) | 50.87 mph (81.87 km/h) |
| 55 mph (88.51 km/h) | 55.96 mph (90.06 km/h) |
| 60 mph (96.56 km/h) | 61.05 mph (98.25 km/h) |
| 65 mph (104.61 km/h) | 66.14 mph (106.44 km/h) |
| 70 mph (112.65 km/h) | 71.22 mph (114.62 km/h) |
| 75 mph (120.7 km/h) | 76.31 mph (122.81 km/h) |
| 80 mph (128.75 km/h) | 81.4 mph (131 km/h) |
| 85 mph (136.79 km/h) | 86.49 mph (139.19 km/h) |
| 90 mph (144.84 km/h) | 91.57 mph (147.37 km/h) |
| 95 mph (152.89 km/h) | 96.66 mph (155.56 km/h) |
| 100 mph (160.93 km/h) | 101.75 mph (163.75 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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