Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 325/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 37.91 (963) | 2 (50.8) 5.6% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 112.83 (2865.76) | 119.11 (3025.35) | 6.28 (159.59) 5.6% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.96 (227.5) | 0 (0) 0% |
| Revolutions per mile (km) | 561.58 (348.95) | 531.95 (330.54) | -29.62 (-18.41) -5.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.11 mph (33.98 km/h) |
| 25 mph (40.23 km/h) | 26.39 mph (42.47 km/h) |
| 30 mph (48.28 km/h) | 31.67 mph (50.97 km/h) |
| 35 mph (56.33 km/h) | 36.95 mph (59.46 km/h) |
| 40 mph (64.37 km/h) | 42.23 mph (67.96 km/h) |
| 45 mph (72.42 km/h) | 47.51 mph (76.45 km/h) |
| 50 mph (80.47 km/h) | 52.78 mph (84.95 km/h) |
| 55 mph (88.51 km/h) | 58.06 mph (93.44 km/h) |
| 60 mph (96.56 km/h) | 63.34 mph (101.94 km/h) |
| 65 mph (104.61 km/h) | 68.62 mph (110.43 km/h) |
| 70 mph (112.65 km/h) | 73.9 mph (118.93 km/h) |
| 75 mph (120.7 km/h) | 79.18 mph (127.42 km/h) |
| 80 mph (128.75 km/h) | 84.46 mph (135.92 km/h) |
| 85 mph (136.79 km/h) | 89.73 mph (144.41 km/h) |
| 90 mph (144.84 km/h) | 95.01 mph (152.91 km/h) |
| 95 mph (152.89 km/h) | 100.29 mph (161.4 km/h) |
| 100 mph (160.93 km/h) | 105.57 mph (169.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1354 | 1573 | 1694 | 1768 | 1849 | 1907 | 1970 | 2045 | 2149 | 2252 | 2368 | 2460 | 2627 | 2811 | 2955 | 3047 | 3099 | 3289 | 3554 | 4130 |
Better Fuel Economy Factory Ratios Increased Power
