Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 38/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 38.1 (967.62) | 0.1 (2.58) 0.3% |
| Width inches (mm) | 15.51 (394) | 13.5 (343) | -2.01 (-51) -12.9% |
| Circum. inches (mm) | 119.36 (3031.76) | 119.68 (3039.87) | 0.32 (8.11) 0.3% |
| Sidewall Height inches (mm) | 9 (228.52) | 9.05 (229.81) | 0.05 (1.29) 0.6% |
| Revolutions per mile (km) | 530.83 (329.84) | 529.41 (328.96) | -1.42 (-0.88) -0.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.05 mph (32.27 km/h) |
| 25 mph (40.23 km/h) | 25.07 mph (40.34 km/h) |
| 30 mph (48.28 km/h) | 30.08 mph (48.41 km/h) |
| 35 mph (56.33 km/h) | 35.09 mph (56.48 km/h) |
| 40 mph (64.37 km/h) | 40.11 mph (64.55 km/h) |
| 45 mph (72.42 km/h) | 45.12 mph (72.61 km/h) |
| 50 mph (80.47 km/h) | 50.13 mph (80.68 km/h) |
| 55 mph (88.51 km/h) | 55.15 mph (88.75 km/h) |
| 60 mph (96.56 km/h) | 60.16 mph (96.82 km/h) |
| 65 mph (104.61 km/h) | 65.17 mph (104.89 km/h) |
| 70 mph (112.65 km/h) | 70.19 mph (112.96 km/h) |
| 75 mph (120.7 km/h) | 75.2 mph (121.02 km/h) |
| 80 mph (128.75 km/h) | 80.21 mph (129.09 km/h) |
| 85 mph (136.79 km/h) | 85.23 mph (137.16 km/h) |
| 90 mph (144.84 km/h) | 90.24 mph (145.23 km/h) |
| 95 mph (152.89 km/h) | 95.25 mph (153.3 km/h) |
| 100 mph (160.93 km/h) | 100.27 mph (161.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1347 | 1565 | 1686 | 1760 | 1840 | 1898 | 1961 | 2035 | 2138 | 2242 | 2356 | 2448 | 2614 | 2798 | 2941 | 3033 | 3084 | 3274 | 3537 | 4111 |
Better Fuel Economy Factory Ratios Increased Power
