Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/65-18 | 325/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.63 (879.7) | 32.07 (814.7) | -2.56 (-65) -7.4% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 108.81 (2763.66) | 100.77 (2559.46) | -8.04 (-204.2) -7.4% |
| Sidewall Height inches (mm) | 8.32 (211.25) | 7.04 (178.75) | -1.28 (-32.5) -15.4% |
| Revolutions per mile (km) | 582.32 (361.84) | 628.78 (390.71) | 46.46 (28.87) 8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.52 mph (29.81 km/h) |
| 25 mph (40.23 km/h) | 23.15 mph (37.26 km/h) |
| 30 mph (48.28 km/h) | 27.78 mph (44.71 km/h) |
| 35 mph (56.33 km/h) | 32.41 mph (52.17 km/h) |
| 40 mph (64.37 km/h) | 37.04 mph (59.62 km/h) |
| 45 mph (72.42 km/h) | 41.68 mph (67.07 km/h) |
| 50 mph (80.47 km/h) | 46.31 mph (74.52 km/h) |
| 55 mph (88.51 km/h) | 50.94 mph (81.97 km/h) |
| 60 mph (96.56 km/h) | 55.57 mph (89.43 km/h) |
| 65 mph (104.61 km/h) | 60.2 mph (96.88 km/h) |
| 70 mph (112.65 km/h) | 64.83 mph (104.33 km/h) |
| 75 mph (120.7 km/h) | 69.46 mph (111.78 km/h) |
| 80 mph (128.75 km/h) | 74.09 mph (119.23 km/h) |
| 85 mph (136.79 km/h) | 78.72 mph (126.69 km/h) |
| 90 mph (144.84 km/h) | 83.35 mph (134.14 km/h) |
| 95 mph (152.89 km/h) | 87.98 mph (141.59 km/h) |
| 100 mph (160.93 km/h) | 92.61 mph (149.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 | 1859 | 2002 | 2090 | 2186 | 2254 | 2329 | 2417 | 2540 | 2662 | 2799 | 2907 | 3105 | 3323 | 3493 | 3602 | 3663 | 3888 | 4201 | 4882 |
Better Fuel Economy Factory Ratios Increased Power
