Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 405/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 35.94 (913) | -2.05 (-52.04) -5.4% |
| Width inches (mm) | 15.51 (394) | 15.94 (405) | 0.43 (11) 2.8% |
| Circum. inches (mm) | 119.36 (3031.76) | 112.92 (2868.27) | -6.44 (-163.49) -5.4% |
| Sidewall Height inches (mm) | 9 (228.52) | 7.97 (202.5) | -1.02 (-26.02) -11.4% |
| Revolutions per mile (km) | 530.83 (329.84) | 561.08 (348.64) | 30.26 (18.8) 5.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.92 mph (30.45 km/h) |
| 25 mph (40.23 km/h) | 23.65 mph (38.06 km/h) |
| 30 mph (48.28 km/h) | 28.38 mph (45.68 km/h) |
| 35 mph (56.33 km/h) | 33.11 mph (53.29 km/h) |
| 40 mph (64.37 km/h) | 37.84 mph (60.9 km/h) |
| 45 mph (72.42 km/h) | 42.57 mph (68.52 km/h) |
| 50 mph (80.47 km/h) | 47.3 mph (76.13 km/h) |
| 55 mph (88.51 km/h) | 52.03 mph (83.74 km/h) |
| 60 mph (96.56 km/h) | 56.76 mph (91.35 km/h) |
| 65 mph (104.61 km/h) | 61.49 mph (98.97 km/h) |
| 70 mph (112.65 km/h) | 66.23 mph (106.58 km/h) |
| 75 mph (120.7 km/h) | 70.96 mph (114.19 km/h) |
| 80 mph (128.75 km/h) | 75.69 mph (121.81 km/h) |
| 85 mph (136.79 km/h) | 80.42 mph (129.42 km/h) |
| 90 mph (144.84 km/h) | 85.15 mph (137.03 km/h) |
| 95 mph (152.89 km/h) | 89.88 mph (144.64 km/h) |
| 100 mph (160.93 km/h) | 94.61 mph (152.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1428 | 1659 | 1786 | 1865 | 1950 | 2011 | 2078 | 2157 | 2266 | 2376 | 2497 | 2594 | 2771 | 2965 | 3117 | 3214 | 3269 | 3469 | 3749 | 4356 |
Better Fuel Economy Factory Ratios Increased Power
