Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 385/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 45.77 (1162.5) | 7.77 (197.46) 20.5% |
| Width inches (mm) | 15.51 (394) | 15.16 (385) | -0.35 (-9) -2.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 143.78 (3652.1) | 24.42 (620.34) 20.5% |
| Sidewall Height inches (mm) | 9 (228.52) | 12.88 (327.25) | 3.89 (98.73) 43.2% |
| Revolutions per mile (km) | 530.83 (329.84) | 440.66 (273.81) | -90.17 (-56.03) -17% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.09 mph (38.77 km/h) |
| 25 mph (40.23 km/h) | 30.12 mph (48.47 km/h) |
| 30 mph (48.28 km/h) | 36.14 mph (58.16 km/h) |
| 35 mph (56.33 km/h) | 42.16 mph (67.85 km/h) |
| 40 mph (64.37 km/h) | 48.18 mph (77.55 km/h) |
| 45 mph (72.42 km/h) | 54.21 mph (87.24 km/h) |
| 50 mph (80.47 km/h) | 60.23 mph (96.93 km/h) |
| 55 mph (88.51 km/h) | 66.25 mph (106.63 km/h) |
| 60 mph (96.56 km/h) | 72.28 mph (116.32 km/h) |
| 65 mph (104.61 km/h) | 78.3 mph (126.01 km/h) |
| 70 mph (112.65 km/h) | 84.32 mph (135.7 km/h) |
| 75 mph (120.7 km/h) | 90.35 mph (145.4 km/h) |
| 80 mph (128.75 km/h) | 96.37 mph (155.09 km/h) |
| 85 mph (136.79 km/h) | 102.39 mph (164.78 km/h) |
| 90 mph (144.84 km/h) | 108.42 mph (174.48 km/h) |
| 95 mph (152.89 km/h) | 114.44 mph (184.17 km/h) |
| 100 mph (160.93 km/h) | 120.46 mph (193.86 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
