Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 285/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 31.22 (793) | 5.23 (132.8) 20.1% |
| Width inches (mm) | 5.71 (145) | 11.22 (285) | 5.51 (140) 96.6% |
| Circum. inches (mm) | 81.66 (2074.08) | 98.08 (2491.28) | 16.43 (417.2) 20.1% |
| Sidewall Height inches (mm) | 4 (101.5) | 5.61 (142.5) | 1.61 (41) 40.4% |
| Revolutions per mile (km) | 775.93 (482.14) | 645.99 (401.4) | -129.94 (-80.74) -16.7% |
285/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.02 mph (38.66 km/h) |
| 25 mph (40.23 km/h) | 30.03 mph (48.33 km/h) |
| 30 mph (48.28 km/h) | 36.03 mph (57.99 km/h) |
| 35 mph (56.33 km/h) | 42.04 mph (67.66 km/h) |
| 40 mph (64.37 km/h) | 48.05 mph (77.32 km/h) |
| 45 mph (72.42 km/h) | 54.05 mph (86.99 km/h) |
| 50 mph (80.47 km/h) | 60.06 mph (96.65 km/h) |
| 55 mph (88.51 km/h) | 66.06 mph (106.32 km/h) |
| 60 mph (96.56 km/h) | 72.07 mph (115.98 km/h) |
| 65 mph (104.61 km/h) | 78.07 mph (125.65 km/h) |
| 70 mph (112.65 km/h) | 84.08 mph (135.31 km/h) |
| 75 mph (120.7 km/h) | 90.09 mph (144.98 km/h) |
| 80 mph (128.75 km/h) | 96.09 mph (154.65 km/h) |
| 85 mph (136.79 km/h) | 102.1 mph (164.31 km/h) |
| 90 mph (144.84 km/h) | 108.1 mph (173.98 km/h) |
| 95 mph (152.89 km/h) | 114.11 mph (183.64 km/h) |
| 100 mph (160.93 km/h) | 120.12 mph (193.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1644 | 1910 | 2057 | 2148 | 2246 | 2315 | 2392 | 2483 | 2609 | 2735 | 2875 | 2987 | 3190 | 3414 | 3589 | 3701 | 3764 | 3994 | 4316 | 5016 |
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