Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 365/80-20 | 40/14-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 42.99 (1092) | 39.9 (1013.52) | -3.09 (-78.48) -7.2% |
| Width inches (mm) | 14.37 (365) | 14.02 (356) | -0.35 (-9) -2.5% |
| Circum. inches (mm) | 135.06 (3430.62) | 125.36 (3184.07) | -9.71 (-246.55) -7.2% |
| Sidewall Height inches (mm) | 11.5 (292) | 9.95 (252.76) | -1.54 (-39.24) -13.4% |
| Revolutions per mile (km) | 469.11 (291.49) | 505.44 (314.06) | 36.32 (22.57) 7.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.56 mph (29.87 km/h) |
| 25 mph (40.23 km/h) | 23.2 mph (37.34 km/h) |
| 30 mph (48.28 km/h) | 27.84 mph (44.81 km/h) |
| 35 mph (56.33 km/h) | 32.48 mph (52.28 km/h) |
| 40 mph (64.37 km/h) | 37.13 mph (59.75 km/h) |
| 45 mph (72.42 km/h) | 41.77 mph (67.22 km/h) |
| 50 mph (80.47 km/h) | 46.41 mph (74.68 km/h) |
| 55 mph (88.51 km/h) | 51.05 mph (82.15 km/h) |
| 60 mph (96.56 km/h) | 55.69 mph (89.62 km/h) |
| 65 mph (104.61 km/h) | 60.33 mph (97.09 km/h) |
| 70 mph (112.65 km/h) | 64.97 mph (104.56 km/h) |
| 75 mph (120.7 km/h) | 69.61 mph (112.03 km/h) |
| 80 mph (128.75 km/h) | 74.25 mph (119.49 km/h) |
| 85 mph (136.79 km/h) | 78.89 mph (126.96 km/h) |
| 90 mph (144.84 km/h) | 83.53 mph (134.43 km/h) |
| 95 mph (152.89 km/h) | 88.17 mph (141.9 km/h) |
| 100 mph (160.93 km/h) | 92.81 mph (149.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1286 | 1494 | 1609 | 1680 | 1757 | 1812 | 1872 | 1943 | 2042 | 2140 | 2250 | 2337 | 2496 | 2671 | 2808 | 2895 | 2945 | 3125 | 3377 | 3924 |
Better Fuel Economy Factory Ratios Increased Power
