Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 325/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 34.07 (865.5) | 0.43 (11) 1.3% |
| Width inches (mm) | 12.4 (315) | 12.8 (325) | 0.39 (10) 3.2% |
| Circum. inches (mm) | 105.69 (2684.49) | 107.05 (2719.05) | 1.36 (34.56) 1.3% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 7.04 (178.75) | 0.22 (5.5) 3.2% |
| Revolutions per mile (km) | 599.5 (372.51) | 591.88 (367.78) | -7.62 (-4.73) -1.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.26 mph (32.6 km/h) |
| 25 mph (40.23 km/h) | 25.32 mph (40.75 km/h) |
| 30 mph (48.28 km/h) | 30.39 mph (48.9 km/h) |
| 35 mph (56.33 km/h) | 35.45 mph (57.05 km/h) |
| 40 mph (64.37 km/h) | 40.51 mph (65.2 km/h) |
| 45 mph (72.42 km/h) | 45.58 mph (73.35 km/h) |
| 50 mph (80.47 km/h) | 50.64 mph (81.5 km/h) |
| 55 mph (88.51 km/h) | 55.71 mph (89.65 km/h) |
| 60 mph (96.56 km/h) | 60.77 mph (97.8 km/h) |
| 65 mph (104.61 km/h) | 65.84 mph (105.95 km/h) |
| 70 mph (112.65 km/h) | 70.9 mph (114.1 km/h) |
| 75 mph (120.7 km/h) | 75.97 mph (122.25 km/h) |
| 80 mph (128.75 km/h) | 81.03 mph (130.41 km/h) |
| 85 mph (136.79 km/h) | 86.09 mph (138.56 km/h) |
| 90 mph (144.84 km/h) | 91.16 mph (146.71 km/h) |
| 95 mph (152.89 km/h) | 96.22 mph (154.86 km/h) |
| 100 mph (160.93 km/h) | 101.29 mph (163.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1506 | 1750 | 1884 | 1968 | 2057 | 2122 | 2192 | 2275 | 2391 | 2506 | 2634 | 2737 | 2923 | 3128 | 3288 | 3391 | 3448 | 3660 | 3955 | 4596 |
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