Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 395/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 40.22 (1021.5) | 2.22 (56.46) 5.9% |
| Width inches (mm) | 15.51 (394) | 15.55 (395) | 0.04 (1) 0.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 126.34 (3209.14) | 6.98 (177.37) 5.9% |
| Sidewall Height inches (mm) | 9 (228.52) | 10.11 (256.75) | 1.11 (28.23) 12.4% |
| Revolutions per mile (km) | 530.83 (329.84) | 501.49 (311.61) | -29.34 (-18.23) -5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.17 mph (34.07 km/h) |
| 25 mph (40.23 km/h) | 26.46 mph (42.59 km/h) |
| 30 mph (48.28 km/h) | 31.76 mph (51.11 km/h) |
| 35 mph (56.33 km/h) | 37.05 mph (59.62 km/h) |
| 40 mph (64.37 km/h) | 42.34 mph (68.14 km/h) |
| 45 mph (72.42 km/h) | 47.63 mph (76.66 km/h) |
| 50 mph (80.47 km/h) | 52.93 mph (85.18 km/h) |
| 55 mph (88.51 km/h) | 58.22 mph (93.69 km/h) |
| 60 mph (96.56 km/h) | 63.51 mph (102.21 km/h) |
| 65 mph (104.61 km/h) | 68.8 mph (110.73 km/h) |
| 70 mph (112.65 km/h) | 74.1 mph (119.25 km/h) |
| 75 mph (120.7 km/h) | 79.39 mph (127.76 km/h) |
| 80 mph (128.75 km/h) | 84.68 mph (136.28 km/h) |
| 85 mph (136.79 km/h) | 89.97 mph (144.8 km/h) |
| 90 mph (144.84 km/h) | 95.27 mph (153.32 km/h) |
| 95 mph (152.89 km/h) | 100.56 mph (161.83 km/h) |
| 100 mph (160.93 km/h) | 105.85 mph (170.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1276 | 1483 | 1597 | 1667 | 1743 | 1798 | 1857 | 1928 | 2026 | 2123 | 2232 | 2319 | 2476 | 2650 | 2786 | 2873 | 2922 | 3101 | 3351 | 3894 |
Better Fuel Economy Factory Ratios Increased Power
