Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/45-17 | 390/45-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.52 (724.3) | 30.82 (782.8) | 2.3 (58.5) 8.1% |
| Width inches (mm) | 12.8 (325) | 15.35 (390) | 2.56 (65) 20% |
| Circum. inches (mm) | 89.58 (2275.46) | 96.82 (2459.24) | 7.24 (183.78) 8.1% |
| Sidewall Height inches (mm) | 5.76 (146.25) | 6.91 (175.5) | 1.15 (29.25) 20% |
| Revolutions per mile (km) | 707.26 (439.47) | 654.41 (406.63) | -52.85 (-32.84) -7.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.62 mph (34.79 km/h) |
| 25 mph (40.23 km/h) | 27.02 mph (43.48 km/h) |
| 30 mph (48.28 km/h) | 32.42 mph (52.18 km/h) |
| 35 mph (56.33 km/h) | 37.83 mph (60.88 km/h) |
| 40 mph (64.37 km/h) | 43.23 mph (69.57 km/h) |
| 45 mph (72.42 km/h) | 48.63 mph (78.27 km/h) |
| 50 mph (80.47 km/h) | 54.04 mph (86.97 km/h) |
| 55 mph (88.51 km/h) | 59.44 mph (95.66 km/h) |
| 60 mph (96.56 km/h) | 64.85 mph (104.36 km/h) |
| 65 mph (104.61 km/h) | 70.25 mph (113.06 km/h) |
| 70 mph (112.65 km/h) | 75.65 mph (121.75 km/h) |
| 75 mph (120.7 km/h) | 81.06 mph (130.45 km/h) |
| 80 mph (128.75 km/h) | 86.46 mph (139.15 km/h) |
| 85 mph (136.79 km/h) | 91.87 mph (147.84 km/h) |
| 90 mph (144.84 km/h) | 97.27 mph (156.54 km/h) |
| 95 mph (152.89 km/h) | 102.67 mph (165.24 km/h) |
| 100 mph (160.93 km/h) | 108.08 mph (173.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1665 | 1935 | 2083 | 2176 | 2275 | 2346 | 2424 | 2516 | 2643 | 2771 | 2913 | 3026 | 3231 | 3458 | 3635 | 3749 | 3813 | 4046 | 4372 | 5081 |
Better Fuel Economy Factory Ratios Increased Power
