Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/45-17 | 275/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.04 (661.3) | 27.5 (698.4) | 1.46 (37.1) 5.6% |
| Width inches (mm) | 10.04 (255) | 10.83 (275) | 0.79 (20) 7.8% |
| Circum. inches (mm) | 81.79 (2077.54) | 86.38 (2194.09) | 4.59 (116.55) 5.6% |
| Sidewall Height inches (mm) | 4.52 (114.75) | 3.25 (82.5) | -1.27 (-32.25) -28.1% |
| Revolutions per mile (km) | 774.64 (481.34) | 733.49 (455.77) | -41.15 (-25.57) -5.3% |
275/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.12 mph (33.99 km/h) |
| 25 mph (40.23 km/h) | 26.4 mph (42.49 km/h) |
| 30 mph (48.28 km/h) | 31.68 mph (50.99 km/h) |
| 35 mph (56.33 km/h) | 36.96 mph (59.49 km/h) |
| 40 mph (64.37 km/h) | 42.24 mph (67.99 km/h) |
| 45 mph (72.42 km/h) | 47.52 mph (76.48 km/h) |
| 50 mph (80.47 km/h) | 52.81 mph (84.98 km/h) |
| 55 mph (88.51 km/h) | 58.09 mph (93.48 km/h) |
| 60 mph (96.56 km/h) | 63.37 mph (101.98 km/h) |
| 65 mph (104.61 km/h) | 68.65 mph (110.48 km/h) |
| 70 mph (112.65 km/h) | 73.93 mph (118.97 km/h) |
| 75 mph (120.7 km/h) | 79.21 mph (127.47 km/h) |
| 80 mph (128.75 km/h) | 84.49 mph (135.97 km/h) |
| 85 mph (136.79 km/h) | 89.77 mph (144.47 km/h) |
| 90 mph (144.84 km/h) | 95.05 mph (152.97 km/h) |
| 95 mph (152.89 km/h) | 100.33 mph (161.47 km/h) |
| 100 mph (160.93 km/h) | 105.61 mph (169.96 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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