Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-19 | 245/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.13 (714.6) | 27.72 (704) | -0.42 (-10.6) -1.5% |
| Width inches (mm) | 5.71 (145) | 9.65 (245) | 3.94 (100) 69% |
| Circum. inches (mm) | 88.39 (2244.98) | 87.07 (2211.68) | -1.31 (-33.3) -1.5% |
| Sidewall Height inches (mm) | 4.57 (116) | 3.86 (98) | -0.71 (-18) -15.5% |
| Revolutions per mile (km) | 716.86 (445.44) | 727.66 (452.14) | 10.79 (6.71) 1.5% |
245/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.7 mph (31.71 km/h) |
| 25 mph (40.23 km/h) | 24.63 mph (39.64 km/h) |
| 30 mph (48.28 km/h) | 29.55 mph (47.56 km/h) |
| 35 mph (56.33 km/h) | 34.48 mph (55.49 km/h) |
| 40 mph (64.37 km/h) | 39.41 mph (63.42 km/h) |
| 45 mph (72.42 km/h) | 44.33 mph (71.35 km/h) |
| 50 mph (80.47 km/h) | 49.26 mph (79.27 km/h) |
| 55 mph (88.51 km/h) | 54.18 mph (87.2 km/h) |
| 60 mph (96.56 km/h) | 59.11 mph (95.13 km/h) |
| 65 mph (104.61 km/h) | 64.04 mph (103.06 km/h) |
| 70 mph (112.65 km/h) | 68.96 mph (110.98 km/h) |
| 75 mph (120.7 km/h) | 73.89 mph (118.91 km/h) |
| 80 mph (128.75 km/h) | 78.81 mph (126.84 km/h) |
| 85 mph (136.79 km/h) | 83.74 mph (134.77 km/h) |
| 90 mph (144.84 km/h) | 88.66 mph (142.69 km/h) |
| 95 mph (152.89 km/h) | 93.59 mph (150.62 km/h) |
| 100 mph (160.93 km/h) | 98.52 mph (158.55 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
