Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 34.81 (884.2) | -1.1 (-28) -3.1% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 112.83 (2865.76) | 109.36 (2777.8) | -3.46 (-87.96) -3.1% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.41 (213.5) | -0.55 (-14) -6.2% |
| Revolutions per mile (km) | 561.58 (348.95) | 579.36 (360) | 17.78 (11.05) 3.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.39 mph (31.2 km/h) |
| 25 mph (40.23 km/h) | 24.23 mph (39 km/h) |
| 30 mph (48.28 km/h) | 29.08 mph (46.8 km/h) |
| 35 mph (56.33 km/h) | 33.93 mph (54.6 km/h) |
| 40 mph (64.37 km/h) | 38.77 mph (62.4 km/h) |
| 45 mph (72.42 km/h) | 43.62 mph (70.2 km/h) |
| 50 mph (80.47 km/h) | 48.47 mph (78 km/h) |
| 55 mph (88.51 km/h) | 53.31 mph (85.8 km/h) |
| 60 mph (96.56 km/h) | 58.16 mph (93.6 km/h) |
| 65 mph (104.61 km/h) | 63 mph (101.4 km/h) |
| 70 mph (112.65 km/h) | 67.85 mph (109.2 km/h) |
| 75 mph (120.7 km/h) | 72.7 mph (117 km/h) |
| 80 mph (128.75 km/h) | 77.54 mph (124.8 km/h) |
| 85 mph (136.79 km/h) | 82.39 mph (132.6 km/h) |
| 90 mph (144.84 km/h) | 87.24 mph (140.4 km/h) |
| 95 mph (152.89 km/h) | 92.08 mph (148.2 km/h) |
| 100 mph (160.93 km/h) | 96.93 mph (155.99 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
