Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/70-17 | 285/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.71 (830.8) | 31.22 (793) | -1.49 (-37.8) -4.5% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 102.76 (2610.04) | 98.08 (2491.28) | -4.68 (-118.75) -4.5% |
| Sidewall Height inches (mm) | 7.85 (199.5) | 5.61 (142.5) | -2.24 (-57) -28.6% |
| Revolutions per mile (km) | 616.6 (383.14) | 645.99 (401.4) | 29.39 (18.26) 4.8% |
285/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.09 mph (30.72 km/h) |
| 25 mph (40.23 km/h) | 23.86 mph (38.4 km/h) |
| 30 mph (48.28 km/h) | 28.64 mph (46.08 km/h) |
| 35 mph (56.33 km/h) | 33.41 mph (53.76 km/h) |
| 40 mph (64.37 km/h) | 38.18 mph (61.44 km/h) |
| 45 mph (72.42 km/h) | 42.95 mph (69.13 km/h) |
| 50 mph (80.47 km/h) | 47.73 mph (76.81 km/h) |
| 55 mph (88.51 km/h) | 52.5 mph (84.49 km/h) |
| 60 mph (96.56 km/h) | 57.27 mph (92.17 km/h) |
| 65 mph (104.61 km/h) | 62.04 mph (99.85 km/h) |
| 70 mph (112.65 km/h) | 66.82 mph (107.53 km/h) |
| 75 mph (120.7 km/h) | 71.59 mph (115.21 km/h) |
| 80 mph (128.75 km/h) | 76.36 mph (122.89 km/h) |
| 85 mph (136.79 km/h) | 81.13 mph (130.57 km/h) |
| 90 mph (144.84 km/h) | 85.91 mph (138.25 km/h) |
| 95 mph (152.89 km/h) | 90.68 mph (145.93 km/h) |
| 100 mph (160.93 km/h) | 95.45 mph (153.61 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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