Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 285/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 31.22 (793) | -6.77 (-172.04) -17.8% |
| Width inches (mm) | 15.51 (394) | 11.22 (285) | -4.29 (-109) -27.7% |
| Circum. inches (mm) | 119.36 (3031.76) | 98.08 (2491.28) | -21.28 (-540.48) -17.8% |
| Sidewall Height inches (mm) | 9 (228.52) | 5.61 (142.5) | -3.39 (-86.02) -37.6% |
| Revolutions per mile (km) | 530.83 (329.84) | 645.99 (401.4) | 115.16 (71.56) 21.7% |
285/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.43 mph (26.45 km/h) |
| 25 mph (40.23 km/h) | 20.54 mph (33.06 km/h) |
| 30 mph (48.28 km/h) | 24.65 mph (39.67 km/h) |
| 35 mph (56.33 km/h) | 28.76 mph (46.29 km/h) |
| 40 mph (64.37 km/h) | 32.87 mph (52.9 km/h) |
| 45 mph (72.42 km/h) | 36.98 mph (59.51 km/h) |
| 50 mph (80.47 km/h) | 41.09 mph (66.12 km/h) |
| 55 mph (88.51 km/h) | 45.2 mph (72.73 km/h) |
| 60 mph (96.56 km/h) | 49.3 mph (79.35 km/h) |
| 65 mph (104.61 km/h) | 53.41 mph (85.96 km/h) |
| 70 mph (112.65 km/h) | 57.52 mph (92.57 km/h) |
| 75 mph (120.7 km/h) | 61.63 mph (99.18 km/h) |
| 80 mph (128.75 km/h) | 65.74 mph (105.8 km/h) |
| 85 mph (136.79 km/h) | 69.85 mph (112.41 km/h) |
| 90 mph (144.84 km/h) | 73.96 mph (119.02 km/h) |
| 95 mph (152.89 km/h) | 78.06 mph (125.63 km/h) |
| 100 mph (160.93 km/h) | 82.17 mph (132.24 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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