Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-20 | 245/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.25 (743) | 27.72 (704) | -1.54 (-39) -5.2% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 91.9 (2334.2) | 87.07 (2211.68) | -4.82 (-122.52) -5.2% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 3.86 (98) | -0.77 (-19.5) -16.6% |
| Revolutions per mile (km) | 689.46 (428.41) | 727.66 (452.14) | 38.19 (23.73) 5.5% |
245/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.95 mph (30.5 km/h) |
| 25 mph (40.23 km/h) | 23.69 mph (38.12 km/h) |
| 30 mph (48.28 km/h) | 28.43 mph (45.75 km/h) |
| 35 mph (56.33 km/h) | 33.16 mph (53.37 km/h) |
| 40 mph (64.37 km/h) | 37.9 mph (60.99 km/h) |
| 45 mph (72.42 km/h) | 42.64 mph (68.62 km/h) |
| 50 mph (80.47 km/h) | 47.38 mph (76.24 km/h) |
| 55 mph (88.51 km/h) | 52.11 mph (83.87 km/h) |
| 60 mph (96.56 km/h) | 56.85 mph (91.49 km/h) |
| 65 mph (104.61 km/h) | 61.59 mph (99.12 km/h) |
| 70 mph (112.65 km/h) | 66.33 mph (106.74 km/h) |
| 75 mph (120.7 km/h) | 71.06 mph (114.37 km/h) |
| 80 mph (128.75 km/h) | 75.8 mph (121.99 km/h) |
| 85 mph (136.79 km/h) | 80.54 mph (129.61 km/h) |
| 90 mph (144.84 km/h) | 85.28 mph (137.24 km/h) |
| 95 mph (152.89 km/h) | 90.01 mph (144.86 km/h) |
| 100 mph (160.93 km/h) | 94.75 mph (152.49 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
