Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 375/40-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 35.81 (909.6) | -2.18 (-55.44) -5.7% |
| Width inches (mm) | 15.51 (394) | 14.76 (375) | -0.75 (-19) -4.8% |
| Circum. inches (mm) | 119.36 (3031.76) | 112.5 (2857.59) | -6.86 (-174.17) -5.7% |
| Sidewall Height inches (mm) | 9 (228.52) | 5.91 (150) | -3.09 (-78.52) -34.4% |
| Revolutions per mile (km) | 530.83 (329.84) | 563.18 (349.94) | 32.35 (20.1) 6.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.85 mph (30.34 km/h) |
| 25 mph (40.23 km/h) | 23.56 mph (37.92 km/h) |
| 30 mph (48.28 km/h) | 28.28 mph (45.51 km/h) |
| 35 mph (56.33 km/h) | 32.99 mph (53.09 km/h) |
| 40 mph (64.37 km/h) | 37.7 mph (60.68 km/h) |
| 45 mph (72.42 km/h) | 42.41 mph (68.26 km/h) |
| 50 mph (80.47 km/h) | 47.13 mph (75.84 km/h) |
| 55 mph (88.51 km/h) | 51.84 mph (83.43 km/h) |
| 60 mph (96.56 km/h) | 56.55 mph (91.01 km/h) |
| 65 mph (104.61 km/h) | 61.27 mph (98.6 km/h) |
| 70 mph (112.65 km/h) | 65.98 mph (106.18 km/h) |
| 75 mph (120.7 km/h) | 70.69 mph (113.77 km/h) |
| 80 mph (128.75 km/h) | 75.4 mph (121.35 km/h) |
| 85 mph (136.79 km/h) | 80.12 mph (128.94 km/h) |
| 90 mph (144.84 km/h) | 84.83 mph (136.52 km/h) |
| 95 mph (152.89 km/h) | 89.54 mph (144.1 km/h) |
| 100 mph (160.93 km/h) | 94.26 mph (151.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1433 | 1665 | 1793 | 1872 | 1958 | 2019 | 2086 | 2165 | 2275 | 2385 | 2507 | 2604 | 2781 | 2976 | 3129 | 3226 | 3281 | 3482 | 3763 | 4373 |
Better Fuel Economy Factory Ratios Increased Power
