Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 375/45-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 35.29 (896.3) | -2.71 (-68.74) -7.1% |
| Width inches (mm) | 15.51 (394) | 14.76 (375) | -0.75 (-19) -4.8% |
| Circum. inches (mm) | 119.36 (3031.76) | 110.86 (2815.81) | -8.5 (-215.95) -7.1% |
| Sidewall Height inches (mm) | 9 (228.52) | 6.64 (168.75) | -2.35 (-59.77) -26.2% |
| Revolutions per mile (km) | 530.83 (329.84) | 571.54 (355.14) | 40.71 (25.3) 7.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.58 mph (29.89 km/h) |
| 25 mph (40.23 km/h) | 23.22 mph (37.37 km/h) |
| 30 mph (48.28 km/h) | 27.86 mph (44.84 km/h) |
| 35 mph (56.33 km/h) | 32.51 mph (52.31 km/h) |
| 40 mph (64.37 km/h) | 37.15 mph (59.79 km/h) |
| 45 mph (72.42 km/h) | 41.79 mph (67.26 km/h) |
| 50 mph (80.47 km/h) | 46.44 mph (74.74 km/h) |
| 55 mph (88.51 km/h) | 51.08 mph (82.21 km/h) |
| 60 mph (96.56 km/h) | 55.73 mph (89.68 km/h) |
| 65 mph (104.61 km/h) | 60.37 mph (97.16 km/h) |
| 70 mph (112.65 km/h) | 65.01 mph (104.63 km/h) |
| 75 mph (120.7 km/h) | 69.66 mph (112.1 km/h) |
| 80 mph (128.75 km/h) | 74.3 mph (119.58 km/h) |
| 85 mph (136.79 km/h) | 78.95 mph (127.05 km/h) |
| 90 mph (144.84 km/h) | 83.59 mph (134.52 km/h) |
| 95 mph (152.89 km/h) | 88.23 mph (142 km/h) |
| 100 mph (160.93 km/h) | 92.88 mph (149.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1454 | 1690 | 1820 | 1900 | 1987 | 2049 | 2117 | 2197 | 2309 | 2420 | 2544 | 2643 | 2822 | 3020 | 3175 | 3274 | 3330 | 3534 | 3819 | 4438 |
Better Fuel Economy Factory Ratios Increased Power
