Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 395/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 35.55 (903) | -2.44 (-62.04) -6.4% |
| Width inches (mm) | 15.51 (394) | 15.55 (395) | 0.04 (1) 0.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 111.69 (2836.86) | -7.67 (-194.9) -6.4% |
| Sidewall Height inches (mm) | 9 (228.52) | 7.78 (197.5) | -1.22 (-31.02) -13.6% |
| Revolutions per mile (km) | 530.83 (329.84) | 567.3 (352.5) | 36.47 (22.66) 6.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.71 mph (30.12 km/h) |
| 25 mph (40.23 km/h) | 23.39 mph (37.65 km/h) |
| 30 mph (48.28 km/h) | 28.07 mph (45.18 km/h) |
| 35 mph (56.33 km/h) | 32.75 mph (52.71 km/h) |
| 40 mph (64.37 km/h) | 37.43 mph (60.24 km/h) |
| 45 mph (72.42 km/h) | 42.11 mph (67.76 km/h) |
| 50 mph (80.47 km/h) | 46.79 mph (75.29 km/h) |
| 55 mph (88.51 km/h) | 51.46 mph (82.82 km/h) |
| 60 mph (96.56 km/h) | 56.14 mph (90.35 km/h) |
| 65 mph (104.61 km/h) | 60.82 mph (97.88 km/h) |
| 70 mph (112.65 km/h) | 65.5 mph (105.41 km/h) |
| 75 mph (120.7 km/h) | 70.18 mph (112.94 km/h) |
| 80 mph (128.75 km/h) | 74.86 mph (120.47 km/h) |
| 85 mph (136.79 km/h) | 79.54 mph (128 km/h) |
| 90 mph (144.84 km/h) | 84.21 mph (135.53 km/h) |
| 95 mph (152.89 km/h) | 88.89 mph (143.06 km/h) |
| 100 mph (160.93 km/h) | 93.57 mph (150.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1444 | 1677 | 1806 | 1886 | 1972 | 2033 | 2101 | 2181 | 2291 | 2402 | 2525 | 2623 | 2801 | 2998 | 3151 | 3250 | 3305 | 3508 | 3790 | 4405 |
Better Fuel Economy Factory Ratios Increased Power
