Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 365/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 42.99 (1092) | 5 (126.96) 13.2% |
| Width inches (mm) | 15.51 (394) | 14.37 (365) | -1.14 (-29) -7.4% |
| Circum. inches (mm) | 119.36 (3031.76) | 135.06 (3430.62) | 15.7 (398.86) 13.2% |
| Sidewall Height inches (mm) | 9 (228.52) | 11.5 (292) | 2.5 (63.48) 27.8% |
| Revolutions per mile (km) | 530.83 (329.84) | 469.11 (291.49) | -61.72 (-38.35) -11.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.63 mph (36.42 km/h) |
| 25 mph (40.23 km/h) | 28.29 mph (45.53 km/h) |
| 30 mph (48.28 km/h) | 33.95 mph (54.63 km/h) |
| 35 mph (56.33 km/h) | 39.6 mph (63.74 km/h) |
| 40 mph (64.37 km/h) | 45.26 mph (72.84 km/h) |
| 45 mph (72.42 km/h) | 50.92 mph (81.95 km/h) |
| 50 mph (80.47 km/h) | 56.58 mph (91.05 km/h) |
| 55 mph (88.51 km/h) | 62.24 mph (100.16 km/h) |
| 60 mph (96.56 km/h) | 67.89 mph (109.26 km/h) |
| 65 mph (104.61 km/h) | 73.55 mph (118.37 km/h) |
| 70 mph (112.65 km/h) | 79.21 mph (127.48 km/h) |
| 75 mph (120.7 km/h) | 84.87 mph (136.58 km/h) |
| 80 mph (128.75 km/h) | 90.52 mph (145.69 km/h) |
| 85 mph (136.79 km/h) | 96.18 mph (154.79 km/h) |
| 90 mph (144.84 km/h) | 101.84 mph (163.9 km/h) |
| 95 mph (152.89 km/h) | 107.5 mph (173 km/h) |
| 100 mph (160.93 km/h) | 113.16 mph (182.11 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1194 | 1387 | 1494 | 1560 | 1631 | 1681 | 1737 | 1803 | 1895 | 1986 | 2088 | 2169 | 2316 | 2479 | 2606 | 2687 | 2733 | 2901 | 3134 | 3642 |
Better Fuel Economy Factory Ratios Increased Power
