Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/65-18 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.63 (879.7) | 34.81 (884.2) | 0.18 (4.5) 0.5% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 108.81 (2763.66) | 109.36 (2777.8) | 0.56 (14.14) 0.5% |
| Sidewall Height inches (mm) | 8.32 (211.25) | 8.41 (213.5) | 0.09 (2.25) 1.1% |
| Revolutions per mile (km) | 582.32 (361.84) | 579.36 (360) | -2.96 (-1.84) -0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.1 mph (32.35 km/h) |
| 25 mph (40.23 km/h) | 25.13 mph (40.44 km/h) |
| 30 mph (48.28 km/h) | 30.15 mph (48.53 km/h) |
| 35 mph (56.33 km/h) | 35.18 mph (56.62 km/h) |
| 40 mph (64.37 km/h) | 40.2 mph (64.7 km/h) |
| 45 mph (72.42 km/h) | 45.23 mph (72.79 km/h) |
| 50 mph (80.47 km/h) | 50.26 mph (80.88 km/h) |
| 55 mph (88.51 km/h) | 55.28 mph (88.97 km/h) |
| 60 mph (96.56 km/h) | 60.31 mph (97.05 km/h) |
| 65 mph (104.61 km/h) | 65.33 mph (105.14 km/h) |
| 70 mph (112.65 km/h) | 70.36 mph (113.23 km/h) |
| 75 mph (120.7 km/h) | 75.38 mph (121.32 km/h) |
| 80 mph (128.75 km/h) | 80.41 mph (129.41 km/h) |
| 85 mph (136.79 km/h) | 85.43 mph (137.49 km/h) |
| 90 mph (144.84 km/h) | 90.46 mph (145.58 km/h) |
| 95 mph (152.89 km/h) | 95.49 mph (153.67 km/h) |
| 100 mph (160.93 km/h) | 100.51 mph (161.76 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1713 | 1845 | 1926 | 2014 | 2077 | 2146 | 2227 | 2340 | 2453 | 2579 | 2679 | 2861 | 3062 | 3218 | 3319 | 3375 | 3582 | 3871 | 4498 |
Better Fuel Economy Factory Ratios Increased Power
