Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 40/14.5-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 39.94 (1014.4) | 1.94 (49.36) 5.1% |
| Width inches (mm) | 15.51 (394) | 14.49 (368) | -1.02 (-26) -6.6% |
| Circum. inches (mm) | 119.36 (3031.76) | 125.47 (3186.83) | 6.11 (155.07) 5.1% |
| Sidewall Height inches (mm) | 9 (228.52) | 7.97 (202.4) | -1.03 (-26.12) -11.4% |
| Revolutions per mile (km) | 530.83 (329.84) | 505 (313.79) | -25.83 (-16.05) -4.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.02 mph (33.83 km/h) |
| 25 mph (40.23 km/h) | 26.28 mph (42.29 km/h) |
| 30 mph (48.28 km/h) | 31.53 mph (50.75 km/h) |
| 35 mph (56.33 km/h) | 36.79 mph (59.21 km/h) |
| 40 mph (64.37 km/h) | 42.05 mph (67.67 km/h) |
| 45 mph (72.42 km/h) | 47.3 mph (76.12 km/h) |
| 50 mph (80.47 km/h) | 52.56 mph (84.58 km/h) |
| 55 mph (88.51 km/h) | 57.81 mph (93.04 km/h) |
| 60 mph (96.56 km/h) | 63.07 mph (101.5 km/h) |
| 65 mph (104.61 km/h) | 68.32 mph (109.96 km/h) |
| 70 mph (112.65 km/h) | 73.58 mph (118.42 km/h) |
| 75 mph (120.7 km/h) | 78.84 mph (126.87 km/h) |
| 80 mph (128.75 km/h) | 84.09 mph (135.33 km/h) |
| 85 mph (136.79 km/h) | 89.35 mph (143.79 km/h) |
| 90 mph (144.84 km/h) | 94.6 mph (152.25 km/h) |
| 95 mph (152.89 km/h) | 99.86 mph (160.71 km/h) |
| 100 mph (160.93 km/h) | 105.11 mph (169.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1285 | 1493 | 1608 | 1679 | 1755 | 1810 | 1870 | 1941 | 2040 | 2138 | 2248 | 2335 | 2494 | 2669 | 2805 | 2893 | 2942 | 3123 | 3374 | 3921 |
Better Fuel Economy Factory Ratios Increased Power
