Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 355/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 39.57 (1005) | 1.57 (39.96) 4.1% |
| Width inches (mm) | 15.51 (394) | 13.98 (355) | -1.54 (-39) -9.9% |
| Circum. inches (mm) | 119.36 (3031.76) | 124.3 (3157.3) | 4.94 (125.54) 4.1% |
| Sidewall Height inches (mm) | 9 (228.52) | 9.78 (248.5) | 0.79 (19.98) 8.7% |
| Revolutions per mile (km) | 530.83 (329.84) | 509.72 (316.73) | -21.11 (-13.11) -4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.83 mph (33.52 km/h) |
| 25 mph (40.23 km/h) | 26.04 mph (41.9 km/h) |
| 30 mph (48.28 km/h) | 31.24 mph (50.28 km/h) |
| 35 mph (56.33 km/h) | 36.45 mph (58.66 km/h) |
| 40 mph (64.37 km/h) | 41.66 mph (67.04 km/h) |
| 45 mph (72.42 km/h) | 46.86 mph (75.42 km/h) |
| 50 mph (80.47 km/h) | 52.07 mph (83.8 km/h) |
| 55 mph (88.51 km/h) | 57.28 mph (92.18 km/h) |
| 60 mph (96.56 km/h) | 62.48 mph (100.56 km/h) |
| 65 mph (104.61 km/h) | 67.69 mph (108.94 km/h) |
| 70 mph (112.65 km/h) | 72.9 mph (117.32 km/h) |
| 75 mph (120.7 km/h) | 78.11 mph (125.7 km/h) |
| 80 mph (128.75 km/h) | 83.31 mph (134.08 km/h) |
| 85 mph (136.79 km/h) | 88.52 mph (142.46 km/h) |
| 90 mph (144.84 km/h) | 93.73 mph (150.84 km/h) |
| 95 mph (152.89 km/h) | 98.93 mph (159.22 km/h) |
| 100 mph (160.93 km/h) | 104.14 mph (167.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1297 | 1507 | 1623 | 1695 | 1772 | 1827 | 1888 | 1960 | 2059 | 2158 | 2269 | 2357 | 2517 | 2694 | 2832 | 2920 | 2970 | 3152 | 3406 | 3958 |
Better Fuel Economy Factory Ratios Increased Power
