Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 365/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 44.43 (1128.5) | 6.44 (163.46) 16.9% |
| Width inches (mm) | 15.51 (394) | 14.37 (365) | -1.14 (-29) -7.4% |
| Circum. inches (mm) | 119.36 (3031.76) | 139.58 (3545.29) | 20.22 (513.52) 16.9% |
| Sidewall Height inches (mm) | 9 (228.52) | 12.21 (310.25) | 3.22 (81.73) 35.8% |
| Revolutions per mile (km) | 530.83 (329.84) | 453.94 (282.06) | -76.89 (-47.78) -14.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.39 mph (37.64 km/h) |
| 25 mph (40.23 km/h) | 29.23 mph (47.05 km/h) |
| 30 mph (48.28 km/h) | 35.08 mph (56.46 km/h) |
| 35 mph (56.33 km/h) | 40.93 mph (65.87 km/h) |
| 40 mph (64.37 km/h) | 46.78 mph (75.28 km/h) |
| 45 mph (72.42 km/h) | 52.62 mph (84.69 km/h) |
| 50 mph (80.47 km/h) | 58.47 mph (94.1 km/h) |
| 55 mph (88.51 km/h) | 64.32 mph (103.51 km/h) |
| 60 mph (96.56 km/h) | 70.16 mph (112.92 km/h) |
| 65 mph (104.61 km/h) | 76.01 mph (122.33 km/h) |
| 70 mph (112.65 km/h) | 81.86 mph (131.74 km/h) |
| 75 mph (120.7 km/h) | 87.7 mph (141.15 km/h) |
| 80 mph (128.75 km/h) | 93.55 mph (150.56 km/h) |
| 85 mph (136.79 km/h) | 99.4 mph (159.96 km/h) |
| 90 mph (144.84 km/h) | 105.24 mph (169.37 km/h) |
| 95 mph (152.89 km/h) | 111.09 mph (178.78 km/h) |
| 100 mph (160.93 km/h) | 116.94 mph (188.19 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
