Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/75-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.83 (935.5) | 32.34 (821.5) | -4.49 (-114) -12.2% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 115.71 (2938.96) | 101.61 (2580.82) | -14.1 (-358.14) -12.2% |
| Sidewall Height inches (mm) | 8.42 (213.75) | 6.17 (156.75) | -2.24 (-57) -26.7% |
| Revolutions per mile (km) | 547.59 (340.26) | 623.58 (387.47) | 75.99 (47.22) 13.9% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.56 mph (28.26 km/h) |
| 25 mph (40.23 km/h) | 21.95 mph (35.33 km/h) |
| 30 mph (48.28 km/h) | 26.34 mph (42.4 km/h) |
| 35 mph (56.33 km/h) | 30.73 mph (49.46 km/h) |
| 40 mph (64.37 km/h) | 35.13 mph (56.53 km/h) |
| 45 mph (72.42 km/h) | 39.52 mph (63.6 km/h) |
| 50 mph (80.47 km/h) | 43.91 mph (70.66 km/h) |
| 55 mph (88.51 km/h) | 48.3 mph (77.73 km/h) |
| 60 mph (96.56 km/h) | 52.69 mph (84.79 km/h) |
| 65 mph (104.61 km/h) | 57.08 mph (91.86 km/h) |
| 70 mph (112.65 km/h) | 61.47 mph (98.93 km/h) |
| 75 mph (120.7 km/h) | 65.86 mph (105.99 km/h) |
| 80 mph (128.75 km/h) | 70.25 mph (113.06 km/h) |
| 85 mph (136.79 km/h) | 74.64 mph (120.12 km/h) |
| 90 mph (144.84 km/h) | 79.03 mph (127.19 km/h) |
| 95 mph (152.89 km/h) | 83.42 mph (134.26 km/h) |
| 100 mph (160.93 km/h) | 87.81 mph (141.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1587 | 1843 | 1985 | 2073 | 2168 | 2235 | 2309 | 2397 | 2519 | 2640 | 2775 | 2883 | 3079 | 3295 | 3464 | 3572 | 3633 | 3856 | 4166 | 4842 |
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