Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/45-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.26 (641.7) | 25.72 (653.2) | 0.45 (11.5) 1.8% |
| Width inches (mm) | 8.07 (205) | 9.65 (245) | 1.57 (40) 19.5% |
| Circum. inches (mm) | 79.37 (2015.96) | 80.79 (2052.09) | 1.42 (36.13) 1.8% |
| Sidewall Height inches (mm) | 3.63 (92.25) | 3.86 (98) | 0.23 (5.75) 6.2% |
| Revolutions per mile (km) | 798.3 (496.04) | 784.25 (487.31) | -14.05 (-8.73) -1.8% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.36 mph (32.76 km/h) |
| 25 mph (40.23 km/h) | 25.45 mph (40.95 km/h) |
| 30 mph (48.28 km/h) | 30.54 mph (49.15 km/h) |
| 35 mph (56.33 km/h) | 35.63 mph (57.34 km/h) |
| 40 mph (64.37 km/h) | 40.72 mph (65.53 km/h) |
| 45 mph (72.42 km/h) | 45.81 mph (73.72 km/h) |
| 50 mph (80.47 km/h) | 50.9 mph (81.91 km/h) |
| 55 mph (88.51 km/h) | 55.99 mph (90.1 km/h) |
| 60 mph (96.56 km/h) | 61.08 mph (98.29 km/h) |
| 65 mph (104.61 km/h) | 66.16 mph (106.48 km/h) |
| 70 mph (112.65 km/h) | 71.25 mph (114.67 km/h) |
| 75 mph (120.7 km/h) | 76.34 mph (122.86 km/h) |
| 80 mph (128.75 km/h) | 81.43 mph (131.06 km/h) |
| 85 mph (136.79 km/h) | 86.52 mph (139.25 km/h) |
| 90 mph (144.84 km/h) | 91.61 mph (147.44 km/h) |
| 95 mph (152.89 km/h) | 96.7 mph (155.63 km/h) |
| 100 mph (160.93 km/h) | 101.79 mph (163.82 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
