Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/55-18 | 245/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.74 (704.7) | 27.72 (704) | -0.03 (-0.7) -0.1% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 87.16 (2213.88) | 87.07 (2211.68) | -0.09 (-2.2) -0.1% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 3.86 (98) | -1.01 (-25.75) -20.8% |
| Revolutions per mile (km) | 726.93 (451.69) | 727.66 (452.14) | 0.72 (0.45) 0.1% |
245/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.98 mph (32.15 km/h) |
| 25 mph (40.23 km/h) | 24.98 mph (40.19 km/h) |
| 30 mph (48.28 km/h) | 29.97 mph (48.23 km/h) |
| 35 mph (56.33 km/h) | 34.97 mph (56.27 km/h) |
| 40 mph (64.37 km/h) | 39.96 mph (64.31 km/h) |
| 45 mph (72.42 km/h) | 44.96 mph (72.35 km/h) |
| 50 mph (80.47 km/h) | 49.95 mph (80.39 km/h) |
| 55 mph (88.51 km/h) | 54.95 mph (88.43 km/h) |
| 60 mph (96.56 km/h) | 59.94 mph (96.46 km/h) |
| 65 mph (104.61 km/h) | 64.94 mph (104.5 km/h) |
| 70 mph (112.65 km/h) | 69.93 mph (112.54 km/h) |
| 75 mph (120.7 km/h) | 74.93 mph (120.58 km/h) |
| 80 mph (128.75 km/h) | 79.92 mph (128.62 km/h) |
| 85 mph (136.79 km/h) | 84.92 mph (136.66 km/h) |
| 90 mph (144.84 km/h) | 89.91 mph (144.7 km/h) |
| 95 mph (152.89 km/h) | 94.91 mph (152.74 km/h) |
| 100 mph (160.93 km/h) | 99.9 mph (160.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1852 | 2151 | 2317 | 2419 | 2529 | 2608 | 2695 | 2797 | 2939 | 3081 | 3239 | 3365 | 3593 | 3845 | 4042 | 4168 | 4239 | 4499 | 4862 | 5650 |
Better Fuel Economy Factory Ratios Increased Power
