Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.68 (677.7) | 25.72 (653.2) | -0.96 (-24.5) -3.6% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 83.82 (2129.06) | 80.79 (2052.09) | -3.03 (-76.97) -3.6% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 3.86 (98) | -0.48 (-12.25) -11.1% |
| Revolutions per mile (km) | 755.9 (469.69) | 784.25 (487.31) | 28.35 (17.62) 3.8% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.28 mph (31.02 km/h) |
| 25 mph (40.23 km/h) | 24.1 mph (38.78 km/h) |
| 30 mph (48.28 km/h) | 28.92 mph (46.53 km/h) |
| 35 mph (56.33 km/h) | 33.73 mph (54.29 km/h) |
| 40 mph (64.37 km/h) | 38.55 mph (62.05 km/h) |
| 45 mph (72.42 km/h) | 43.37 mph (69.8 km/h) |
| 50 mph (80.47 km/h) | 48.19 mph (77.56 km/h) |
| 55 mph (88.51 km/h) | 53.01 mph (85.31 km/h) |
| 60 mph (96.56 km/h) | 57.83 mph (93.07 km/h) |
| 65 mph (104.61 km/h) | 62.65 mph (100.83 km/h) |
| 70 mph (112.65 km/h) | 67.47 mph (108.58 km/h) |
| 75 mph (120.7 km/h) | 72.29 mph (116.34 km/h) |
| 80 mph (128.75 km/h) | 77.11 mph (124.09 km/h) |
| 85 mph (136.79 km/h) | 81.93 mph (131.85 km/h) |
| 90 mph (144.84 km/h) | 86.75 mph (139.6 km/h) |
| 95 mph (152.89 km/h) | 91.57 mph (147.36 km/h) |
| 100 mph (160.93 km/h) | 96.38 mph (155.12 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
