Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 38/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 38.03 (965.92) | 0.03 (0.88) 0.1% |
| Width inches (mm) | 15.51 (394) | 12.52 (318) | -2.99 (-76) -19.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 119.47 (3034.53) | 0.11 (2.76) 0.1% |
| Sidewall Height inches (mm) | 9 (228.52) | 9.01 (228.96) | 0.02 (0.44) 0.2% |
| Revolutions per mile (km) | 530.83 (329.84) | 530.34 (329.54) | -0.48 (-0.3) -0.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.02 mph (32.22 km/h) |
| 25 mph (40.23 km/h) | 25.02 mph (40.27 km/h) |
| 30 mph (48.28 km/h) | 30.03 mph (48.32 km/h) |
| 35 mph (56.33 km/h) | 35.03 mph (56.38 km/h) |
| 40 mph (64.37 km/h) | 40.04 mph (64.43 km/h) |
| 45 mph (72.42 km/h) | 45.04 mph (72.49 km/h) |
| 50 mph (80.47 km/h) | 50.05 mph (80.54 km/h) |
| 55 mph (88.51 km/h) | 55.05 mph (88.59 km/h) |
| 60 mph (96.56 km/h) | 60.05 mph (96.65 km/h) |
| 65 mph (104.61 km/h) | 65.06 mph (104.7 km/h) |
| 70 mph (112.65 km/h) | 70.06 mph (112.76 km/h) |
| 75 mph (120.7 km/h) | 75.07 mph (120.81 km/h) |
| 80 mph (128.75 km/h) | 80.07 mph (128.87 km/h) |
| 85 mph (136.79 km/h) | 85.08 mph (136.92 km/h) |
| 90 mph (144.84 km/h) | 90.08 mph (144.97 km/h) |
| 95 mph (152.89 km/h) | 95.09 mph (153.03 km/h) |
| 100 mph (160.93 km/h) | 100.09 mph (161.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1350 | 1568 | 1688 | 1763 | 1844 | 1901 | 1964 | 2039 | 2142 | 2246 | 2360 | 2452 | 2619 | 2803 | 2946 | 3038 | 3090 | 3279 | 3543 | 4118 |
Better Fuel Economy Factory Ratios Increased Power
