Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 285/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 31.22 (793) | 3.75 (95.3) 13.7% |
| Width inches (mm) | 7.28 (185) | 11.22 (285) | 3.94 (100) 54.1% |
| Circum. inches (mm) | 86.29 (2191.89) | 98.08 (2491.28) | 11.79 (299.39) 13.7% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 5.61 (142.5) | 0.88 (22.25) 18.5% |
| Revolutions per mile (km) | 734.23 (456.23) | 645.99 (401.4) | -88.24 (-54.83) -12% |
285/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.73 mph (36.58 km/h) |
| 25 mph (40.23 km/h) | 28.41 mph (45.73 km/h) |
| 30 mph (48.28 km/h) | 34.1 mph (54.88 km/h) |
| 35 mph (56.33 km/h) | 39.78 mph (64.02 km/h) |
| 40 mph (64.37 km/h) | 45.46 mph (73.17 km/h) |
| 45 mph (72.42 km/h) | 51.15 mph (82.31 km/h) |
| 50 mph (80.47 km/h) | 56.83 mph (91.46 km/h) |
| 55 mph (88.51 km/h) | 62.51 mph (100.6 km/h) |
| 60 mph (96.56 km/h) | 68.2 mph (109.75 km/h) |
| 65 mph (104.61 km/h) | 73.88 mph (118.9 km/h) |
| 70 mph (112.65 km/h) | 79.56 mph (128.04 km/h) |
| 75 mph (120.7 km/h) | 85.24 mph (137.19 km/h) |
| 80 mph (128.75 km/h) | 90.93 mph (146.33 km/h) |
| 85 mph (136.79 km/h) | 96.61 mph (155.48 km/h) |
| 90 mph (144.84 km/h) | 102.29 mph (164.63 km/h) |
| 95 mph (152.89 km/h) | 107.98 mph (173.77 km/h) |
| 100 mph (160.93 km/h) | 113.66 mph (182.92 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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