Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 305/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 27.61 (701.2) | -1.2 (-30.5) -4.2% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 90.5 (2298.7) | 86.73 (2202.88) | -3.77 (-95.82) -4.2% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 4.8 (122) | -0.6 (-15.25) -11.1% |
| Revolutions per mile (km) | 700.11 (435.03) | 730.56 (453.95) | 30.45 (18.92) 4.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.17 mph (30.85 km/h) |
| 25 mph (40.23 km/h) | 23.96 mph (38.56 km/h) |
| 30 mph (48.28 km/h) | 28.75 mph (46.27 km/h) |
| 35 mph (56.33 km/h) | 33.54 mph (53.98 km/h) |
| 40 mph (64.37 km/h) | 38.33 mph (61.69 km/h) |
| 45 mph (72.42 km/h) | 43.12 mph (69.4 km/h) |
| 50 mph (80.47 km/h) | 47.92 mph (77.11 km/h) |
| 55 mph (88.51 km/h) | 52.71 mph (84.82 km/h) |
| 60 mph (96.56 km/h) | 57.5 mph (92.54 km/h) |
| 65 mph (104.61 km/h) | 62.29 mph (100.25 km/h) |
| 70 mph (112.65 km/h) | 67.08 mph (107.96 km/h) |
| 75 mph (120.7 km/h) | 71.87 mph (115.67 km/h) |
| 80 mph (128.75 km/h) | 76.67 mph (123.38 km/h) |
| 85 mph (136.79 km/h) | 81.46 mph (131.09 km/h) |
| 90 mph (144.84 km/h) | 86.25 mph (138.8 km/h) |
| 95 mph (152.89 km/h) | 91.04 mph (146.52 km/h) |
| 100 mph (160.93 km/h) | 95.83 mph (154.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1859 | 2160 | 2326 | 2429 | 2540 | 2619 | 2706 | 2808 | 2951 | 3093 | 3252 | 3378 | 3608 | 3861 | 4058 | 4185 | 4256 | 4517 | 4881 | 5672 |
Better Fuel Economy Factory Ratios Increased Power
