Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/60-20 | 315/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.8 (706) | 29.92 (760) | 2.13 (54) 7.6% |
| Width inches (mm) | 6.5 (165) | 12.4 (315) | 5.91 (150) 90.9% |
| Circum. inches (mm) | 87.32 (2217.96) | 94 (2387.61) | 6.68 (169.65) 7.6% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.96 (126) | 1.06 (27) 27.3% |
| Revolutions per mile (km) | 725.6 (450.86) | 674.04 (418.83) | -51.56 (-32.04) -7.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.53 mph (34.65 km/h) |
| 25 mph (40.23 km/h) | 26.91 mph (43.31 km/h) |
| 30 mph (48.28 km/h) | 32.29 mph (51.97 km/h) |
| 35 mph (56.33 km/h) | 37.68 mph (60.64 km/h) |
| 40 mph (64.37 km/h) | 43.06 mph (69.3 km/h) |
| 45 mph (72.42 km/h) | 48.44 mph (77.96 km/h) |
| 50 mph (80.47 km/h) | 53.82 mph (86.62 km/h) |
| 55 mph (88.51 km/h) | 59.21 mph (95.28 km/h) |
| 60 mph (96.56 km/h) | 64.59 mph (103.95 km/h) |
| 65 mph (104.61 km/h) | 69.97 mph (112.61 km/h) |
| 70 mph (112.65 km/h) | 75.35 mph (121.27 km/h) |
| 75 mph (120.7 km/h) | 80.74 mph (129.93 km/h) |
| 80 mph (128.75 km/h) | 86.12 mph (138.6 km/h) |
| 85 mph (136.79 km/h) | 91.5 mph (147.26 km/h) |
| 90 mph (144.84 km/h) | 96.88 mph (155.92 km/h) |
| 95 mph (152.89 km/h) | 102.27 mph (164.58 km/h) |
| 100 mph (160.93 km/h) | 107.65 mph (173.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1715 | 1993 | 2146 | 2241 | 2343 | 2416 | 2496 | 2591 | 2723 | 2854 | 3000 | 3117 | 3328 | 3562 | 3744 | 3861 | 3927 | 4168 | 4504 | 5233 |
Better Fuel Economy Factory Ratios Increased Power
