Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 235/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 23.55 (598.2) | -4.69 (-119) -16.6% |
| Width inches (mm) | 12.8 (325) | 9.25 (235) | -3.54 (-90) -27.7% |
| Circum. inches (mm) | 88.71 (2253.15) | 73.99 (1879.3) | -14.72 (-373.85) -16.6% |
| Sidewall Height inches (mm) | 5.12 (130) | 2.78 (70.5) | -2.34 (-59.5) -45.8% |
| Revolutions per mile (km) | 714.26 (443.82) | 856.35 (532.11) | 142.09 (88.29) 19.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.68 mph (26.85 km/h) |
| 25 mph (40.23 km/h) | 20.85 mph (33.56 km/h) |
| 30 mph (48.28 km/h) | 25.02 mph (40.27 km/h) |
| 35 mph (56.33 km/h) | 29.19 mph (46.98 km/h) |
| 40 mph (64.37 km/h) | 33.36 mph (53.69 km/h) |
| 45 mph (72.42 km/h) | 37.53 mph (60.4 km/h) |
| 50 mph (80.47 km/h) | 41.7 mph (67.12 km/h) |
| 55 mph (88.51 km/h) | 45.87 mph (73.83 km/h) |
| 60 mph (96.56 km/h) | 50.04 mph (80.54 km/h) |
| 65 mph (104.61 km/h) | 54.22 mph (87.25 km/h) |
| 70 mph (112.65 km/h) | 58.39 mph (93.96 km/h) |
| 75 mph (120.7 km/h) | 62.56 mph (100.67 km/h) |
| 80 mph (128.75 km/h) | 66.73 mph (107.39 km/h) |
| 85 mph (136.79 km/h) | 70.9 mph (114.1 km/h) |
| 90 mph (144.84 km/h) | 75.07 mph (120.81 km/h) |
| 95 mph (152.89 km/h) | 79.24 mph (127.52 km/h) |
| 100 mph (160.93 km/h) | 83.41 mph (134.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2179 | 2532 | 2726 | 2847 | 2977 | 3070 | 3172 | 3292 | 3459 | 3626 | 3811 | 3960 | 4229 | 4525 | 4757 | 4906 | 4989 | 5295 | 5722 | 6649 |
Better Fuel Economy Factory Ratios Increased Power
