Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/13.5-20 | 385/58-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 38.1 (967.62) | 37.58 (954.6) | -0.51 (-13.02) -1.3% |
| Width inches (mm) | 13.5 (343) | 15.16 (385) | 1.65 (42) 12.2% |
| Circum. inches (mm) | 119.68 (3039.87) | 118.07 (2998.96) | -1.61 (-40.9) -1.3% |
| Sidewall Height inches (mm) | 9.05 (229.81) | 8.79 (223.3) | -0.26 (-6.51) -2.8% |
| Revolutions per mile (km) | 529.41 (328.96) | 536.63 (333.45) | 7.22 (4.49) 1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.73 mph (31.75 km/h) |
| 25 mph (40.23 km/h) | 24.66 mph (39.69 km/h) |
| 30 mph (48.28 km/h) | 29.6 mph (47.63 km/h) |
| 35 mph (56.33 km/h) | 34.53 mph (55.57 km/h) |
| 40 mph (64.37 km/h) | 39.46 mph (63.51 km/h) |
| 45 mph (72.42 km/h) | 44.39 mph (71.45 km/h) |
| 50 mph (80.47 km/h) | 49.33 mph (79.38 km/h) |
| 55 mph (88.51 km/h) | 54.26 mph (87.32 km/h) |
| 60 mph (96.56 km/h) | 59.19 mph (95.26 km/h) |
| 65 mph (104.61 km/h) | 64.13 mph (103.2 km/h) |
| 70 mph (112.65 km/h) | 69.06 mph (111.14 km/h) |
| 75 mph (120.7 km/h) | 73.99 mph (119.08 km/h) |
| 80 mph (128.75 km/h) | 78.92 mph (127.02 km/h) |
| 85 mph (136.79 km/h) | 83.86 mph (134.95 km/h) |
| 90 mph (144.84 km/h) | 88.79 mph (142.89 km/h) |
| 95 mph (152.89 km/h) | 93.72 mph (150.83 km/h) |
| 100 mph (160.93 km/h) | 98.65 mph (158.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1366 | 1586 | 1708 | 1784 | 1865 | 1924 | 1987 | 2063 | 2168 | 2272 | 2388 | 2481 | 2650 | 2836 | 2981 | 3074 | 3126 | 3318 | 3586 | 4167 |
Better Fuel Economy Factory Ratios Increased Power
