Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 375/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 33.29 (845.5) | -4.71 (-119.54) -12.4% |
| Width inches (mm) | 15.51 (394) | 14.76 (375) | -0.75 (-19) -4.8% |
| Circum. inches (mm) | 119.36 (3031.76) | 104.58 (2656.22) | -14.79 (-375.55) -12.4% |
| Sidewall Height inches (mm) | 9 (228.52) | 6.64 (168.75) | -2.35 (-59.77) -26.2% |
| Revolutions per mile (km) | 530.83 (329.84) | 605.88 (376.47) | 75.05 (46.63) 14.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.52 mph (28.2 km/h) |
| 25 mph (40.23 km/h) | 21.9 mph (35.25 km/h) |
| 30 mph (48.28 km/h) | 26.28 mph (42.3 km/h) |
| 35 mph (56.33 km/h) | 30.66 mph (49.35 km/h) |
| 40 mph (64.37 km/h) | 35.05 mph (56.4 km/h) |
| 45 mph (72.42 km/h) | 39.43 mph (63.45 km/h) |
| 50 mph (80.47 km/h) | 43.81 mph (70.5 km/h) |
| 55 mph (88.51 km/h) | 48.19 mph (77.55 km/h) |
| 60 mph (96.56 km/h) | 52.57 mph (84.6 km/h) |
| 65 mph (104.61 km/h) | 56.95 mph (91.65 km/h) |
| 70 mph (112.65 km/h) | 61.33 mph (98.7 km/h) |
| 75 mph (120.7 km/h) | 65.71 mph (105.75 km/h) |
| 80 mph (128.75 km/h) | 70.09 mph (112.8 km/h) |
| 85 mph (136.79 km/h) | 74.47 mph (119.85 km/h) |
| 90 mph (144.84 km/h) | 78.85 mph (126.9 km/h) |
| 95 mph (152.89 km/h) | 83.23 mph (133.95 km/h) |
| 100 mph (160.93 km/h) | 87.61 mph (141 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1542 | 1791 | 1929 | 2014 | 2106 | 2172 | 2244 | 2329 | 2447 | 2565 | 2697 | 2802 | 2992 | 3202 | 3366 | 3471 | 3530 | 3746 | 4048 | 4704 |
Better Fuel Economy Factory Ratios Increased Power
