Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 240/40-19 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.56 (674.6) | 28.68 (728.5) | 2.12 (53.9) 8% |
| Width inches (mm) | 9.45 (240) | 9.65 (245) | 0.2 (5) 2.1% |
| Circum. inches (mm) | 83.44 (2119.32) | 90.1 (2288.65) | 6.67 (169.33) 8% |
| Sidewall Height inches (mm) | 3.78 (96) | 4.34 (110.25) | 0.56 (14.25) 14.8% |
| Revolutions per mile (km) | 759.37 (471.85) | 703.18 (436.94) | -56.18 (-34.91) -7.4% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.6 mph (34.76 km/h) |
| 25 mph (40.23 km/h) | 27 mph (43.45 km/h) |
| 30 mph (48.28 km/h) | 32.4 mph (52.14 km/h) |
| 35 mph (56.33 km/h) | 37.8 mph (60.83 km/h) |
| 40 mph (64.37 km/h) | 43.2 mph (69.52 km/h) |
| 45 mph (72.42 km/h) | 48.6 mph (78.21 km/h) |
| 50 mph (80.47 km/h) | 53.99 mph (86.9 km/h) |
| 55 mph (88.51 km/h) | 59.39 mph (95.59 km/h) |
| 60 mph (96.56 km/h) | 64.79 mph (104.28 km/h) |
| 65 mph (104.61 km/h) | 70.19 mph (112.97 km/h) |
| 70 mph (112.65 km/h) | 75.59 mph (121.66 km/h) |
| 75 mph (120.7 km/h) | 80.99 mph (130.34 km/h) |
| 80 mph (128.75 km/h) | 86.39 mph (139.03 km/h) |
| 85 mph (136.79 km/h) | 91.79 mph (147.72 km/h) |
| 90 mph (144.84 km/h) | 97.19 mph (156.41 km/h) |
| 95 mph (152.89 km/h) | 102.59 mph (165.1 km/h) |
| 100 mph (160.93 km/h) | 107.99 mph (173.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
Better Fuel Economy Factory Ratios Increased Power
