Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 315/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 34.36 (872.8) | 0.72 (18.3) 2.1% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 105.69 (2684.49) | 107.95 (2741.98) | 2.26 (57.49) 2.1% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 8.68 (220.5) | 1.86 (47.25) 27.3% |
| Revolutions per mile (km) | 599.5 (372.51) | 586.93 (364.7) | -12.57 (-7.81) -2.1% |
315/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.88 km/h) |
| 25 mph (40.23 km/h) | 25.54 mph (41.1 km/h) |
| 30 mph (48.28 km/h) | 30.64 mph (49.31 km/h) |
| 35 mph (56.33 km/h) | 35.75 mph (57.53 km/h) |
| 40 mph (64.37 km/h) | 40.86 mph (65.75 km/h) |
| 45 mph (72.42 km/h) | 45.96 mph (73.97 km/h) |
| 50 mph (80.47 km/h) | 51.07 mph (82.19 km/h) |
| 55 mph (88.51 km/h) | 56.18 mph (90.41 km/h) |
| 60 mph (96.56 km/h) | 61.28 mph (98.63 km/h) |
| 65 mph (104.61 km/h) | 66.39 mph (106.85 km/h) |
| 70 mph (112.65 km/h) | 71.5 mph (115.07 km/h) |
| 75 mph (120.7 km/h) | 76.61 mph (123.29 km/h) |
| 80 mph (128.75 km/h) | 81.71 mph (131.51 km/h) |
| 85 mph (136.79 km/h) | 86.82 mph (139.72 km/h) |
| 90 mph (144.84 km/h) | 91.93 mph (147.94 km/h) |
| 95 mph (152.89 km/h) | 97.03 mph (156.16 km/h) |
| 100 mph (160.93 km/h) | 102.14 mph (164.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1494 | 1735 | 1869 | 1951 | 2040 | 2104 | 2174 | 2256 | 2371 | 2485 | 2612 | 2714 | 2898 | 3102 | 3261 | 3362 | 3419 | 3629 | 3922 | 4557 |
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