Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 325/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 36.63 (930.5) | 0.72 (18.3) 2% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 112.83 (2865.76) | 115.09 (2923.25) | 2.26 (57.49) 2% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.32 (211.25) | -0.64 (-16.25) -7.1% |
| Revolutions per mile (km) | 561.58 (348.95) | 550.53 (342.08) | -11.04 (-6.86) -2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.83 km/h) |
| 25 mph (40.23 km/h) | 25.5 mph (41.04 km/h) |
| 30 mph (48.28 km/h) | 30.6 mph (49.25 km/h) |
| 35 mph (56.33 km/h) | 35.7 mph (57.46 km/h) |
| 40 mph (64.37 km/h) | 40.8 mph (65.67 km/h) |
| 45 mph (72.42 km/h) | 45.9 mph (73.87 km/h) |
| 50 mph (80.47 km/h) | 51 mph (82.08 km/h) |
| 55 mph (88.51 km/h) | 56.1 mph (90.29 km/h) |
| 60 mph (96.56 km/h) | 61.2 mph (98.5 km/h) |
| 65 mph (104.61 km/h) | 66.3 mph (106.71 km/h) |
| 70 mph (112.65 km/h) | 71.4 mph (114.91 km/h) |
| 75 mph (120.7 km/h) | 76.5 mph (123.12 km/h) |
| 80 mph (128.75 km/h) | 81.6 mph (131.33 km/h) |
| 85 mph (136.79 km/h) | 86.71 mph (139.54 km/h) |
| 90 mph (144.84 km/h) | 91.81 mph (147.75 km/h) |
| 95 mph (152.89 km/h) | 96.91 mph (155.96 km/h) |
| 100 mph (160.93 km/h) | 102.01 mph (164.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1401 | 1628 | 1753 | 1830 | 1914 | 1973 | 2039 | 2116 | 2224 | 2331 | 2450 | 2546 | 2719 | 2909 | 3058 | 3154 | 3207 | 3404 | 3678 | 4275 |
Better Fuel Economy Factory Ratios Increased Power
