Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 25.72 (653.2) | 0.63 (16) 2.5% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 78.81 (2001.82) | 80.79 (2052.09) | 1.98 (50.27) 2.5% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.86 (98) | 0.31 (8) 8.9% |
| Revolutions per mile (km) | 803.94 (499.54) | 784.25 (487.31) | -19.69 (-12.24) -2.4% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.5 mph (33 km/h) |
| 25 mph (40.23 km/h) | 25.63 mph (41.24 km/h) |
| 30 mph (48.28 km/h) | 30.75 mph (49.49 km/h) |
| 35 mph (56.33 km/h) | 35.88 mph (57.74 km/h) |
| 40 mph (64.37 km/h) | 41 mph (65.99 km/h) |
| 45 mph (72.42 km/h) | 46.13 mph (74.24 km/h) |
| 50 mph (80.47 km/h) | 51.26 mph (82.49 km/h) |
| 55 mph (88.51 km/h) | 56.38 mph (90.74 km/h) |
| 60 mph (96.56 km/h) | 61.51 mph (98.99 km/h) |
| 65 mph (104.61 km/h) | 66.63 mph (107.23 km/h) |
| 70 mph (112.65 km/h) | 71.76 mph (115.48 km/h) |
| 75 mph (120.7 km/h) | 76.88 mph (123.73 km/h) |
| 80 mph (128.75 km/h) | 82.01 mph (131.98 km/h) |
| 85 mph (136.79 km/h) | 87.13 mph (140.23 km/h) |
| 90 mph (144.84 km/h) | 92.26 mph (148.48 km/h) |
| 95 mph (152.89 km/h) | 97.39 mph (156.73 km/h) |
| 100 mph (160.93 km/h) | 102.51 mph (164.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 2318 | 2497 | 2607 | 2726 | 2811 | 2904 | 3015 | 3168 | 3321 | 3490 | 3626 | 3873 | 4144 | 4357 | 4493 | 4569 | 4849 | 5240 | 6089 |
Better Fuel Economy Factory Ratios Increased Power
