Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 375/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 39.19 (995.5) | 1.2 (30.46) 3.2% |
| Width inches (mm) | 15.51 (394) | 14.76 (375) | -0.75 (-19) -4.8% |
| Circum. inches (mm) | 119.36 (3031.76) | 123.13 (3127.46) | 3.77 (95.69) 3.2% |
| Sidewall Height inches (mm) | 9 (228.52) | 9.6 (243.75) | 0.6 (15.23) 6.7% |
| Revolutions per mile (km) | 530.83 (329.84) | 514.59 (319.75) | -16.24 (-10.09) -3.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.63 mph (33.2 km/h) |
| 25 mph (40.23 km/h) | 25.79 mph (41.5 km/h) |
| 30 mph (48.28 km/h) | 30.95 mph (49.8 km/h) |
| 35 mph (56.33 km/h) | 36.1 mph (58.11 km/h) |
| 40 mph (64.37 km/h) | 41.26 mph (66.41 km/h) |
| 45 mph (72.42 km/h) | 46.42 mph (74.71 km/h) |
| 50 mph (80.47 km/h) | 51.58 mph (83.01 km/h) |
| 55 mph (88.51 km/h) | 56.74 mph (91.31 km/h) |
| 60 mph (96.56 km/h) | 61.89 mph (99.61 km/h) |
| 65 mph (104.61 km/h) | 67.05 mph (107.91 km/h) |
| 70 mph (112.65 km/h) | 72.21 mph (116.21 km/h) |
| 75 mph (120.7 km/h) | 77.37 mph (124.51 km/h) |
| 80 mph (128.75 km/h) | 82.53 mph (132.81 km/h) |
| 85 mph (136.79 km/h) | 87.68 mph (141.11 km/h) |
| 90 mph (144.84 km/h) | 92.84 mph (149.41 km/h) |
| 95 mph (152.89 km/h) | 98 mph (157.71 km/h) |
| 100 mph (160.93 km/h) | 103.16 mph (166.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1310 | 1521 | 1638 | 1711 | 1789 | 1844 | 1906 | 1978 | 2079 | 2179 | 2290 | 2379 | 2541 | 2719 | 2859 | 2948 | 2998 | 3182 | 3438 | 3995 |
Better Fuel Economy Factory Ratios Increased Power
