Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-20 | 305/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.22 (793) | 33.81 (858.8) | 2.59 (65.8) 8.3% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 98.08 (2491.28) | 106.22 (2698) | 8.14 (206.72) 8.3% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 8.41 (213.5) | 2.8 (71) 49.8% |
| Revolutions per mile (km) | 645.99 (401.4) | 596.5 (370.64) | -49.49 (-30.75) -7.7% |
305/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.66 mph (34.86 km/h) |
| 25 mph (40.23 km/h) | 27.07 mph (43.57 km/h) |
| 30 mph (48.28 km/h) | 32.49 mph (52.29 km/h) |
| 35 mph (56.33 km/h) | 37.9 mph (61 km/h) |
| 40 mph (64.37 km/h) | 43.32 mph (69.72 km/h) |
| 45 mph (72.42 km/h) | 48.73 mph (78.43 km/h) |
| 50 mph (80.47 km/h) | 54.15 mph (87.14 km/h) |
| 55 mph (88.51 km/h) | 59.56 mph (95.86 km/h) |
| 60 mph (96.56 km/h) | 64.98 mph (104.57 km/h) |
| 65 mph (104.61 km/h) | 70.39 mph (113.29 km/h) |
| 70 mph (112.65 km/h) | 75.81 mph (122 km/h) |
| 75 mph (120.7 km/h) | 81.22 mph (130.72 km/h) |
| 80 mph (128.75 km/h) | 86.64 mph (139.43 km/h) |
| 85 mph (136.79 km/h) | 92.05 mph (148.15 km/h) |
| 90 mph (144.84 km/h) | 97.47 mph (156.86 km/h) |
| 95 mph (152.89 km/h) | 102.88 mph (165.57 km/h) |
| 100 mph (160.93 km/h) | 108.3 mph (174.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1518 | 1763 | 1899 | 1983 | 2073 | 2138 | 2209 | 2293 | 2409 | 2526 | 2655 | 2758 | 2946 | 3152 | 3314 | 3417 | 3475 | 3688 | 3985 | 4631 |
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