Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-17 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.97 (634.3) | 25.72 (653.2) | 0.74 (18.9) 3% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 78.45 (1992.71) | 80.79 (2052.09) | 2.34 (59.38) 3% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 3.86 (98) | -0.13 (-3.25) -3.2% |
| Revolutions per mile (km) | 807.61 (501.83) | 784.25 (487.31) | -23.37 (-14.52) -2.9% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.6 mph (33.15 km/h) |
| 25 mph (40.23 km/h) | 25.74 mph (41.43 km/h) |
| 30 mph (48.28 km/h) | 30.89 mph (49.72 km/h) |
| 35 mph (56.33 km/h) | 36.04 mph (58.01 km/h) |
| 40 mph (64.37 km/h) | 41.19 mph (66.29 km/h) |
| 45 mph (72.42 km/h) | 46.34 mph (74.58 km/h) |
| 50 mph (80.47 km/h) | 51.49 mph (82.87 km/h) |
| 55 mph (88.51 km/h) | 56.64 mph (91.15 km/h) |
| 60 mph (96.56 km/h) | 61.79 mph (99.44 km/h) |
| 65 mph (104.61 km/h) | 66.94 mph (107.72 km/h) |
| 70 mph (112.65 km/h) | 72.09 mph (116.01 km/h) |
| 75 mph (120.7 km/h) | 77.23 mph (124.3 km/h) |
| 80 mph (128.75 km/h) | 82.38 mph (132.58 km/h) |
| 85 mph (136.79 km/h) | 87.53 mph (140.87 km/h) |
| 90 mph (144.84 km/h) | 92.68 mph (149.16 km/h) |
| 95 mph (152.89 km/h) | 97.83 mph (157.44 km/h) |
| 100 mph (160.93 km/h) | 102.98 mph (165.73 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
