Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 365/80-20 | 40/14.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 42.99 (1092) | 39.99 (1015.84) | -3 (-76.16) -7% |
| Width inches (mm) | 14.37 (365) | 14.49 (368) | 0.12 (3) 0.8% |
| Circum. inches (mm) | 135.06 (3430.62) | 125.64 (3191.36) | -9.42 (-239.26) -7% |
| Sidewall Height inches (mm) | 11.5 (292) | 10 (253.92) | -1.5 (-38.08) -13% |
| Revolutions per mile (km) | 469.11 (291.49) | 504.28 (313.35) | 35.17 (21.85) 7.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.61 mph (29.94 km/h) |
| 25 mph (40.23 km/h) | 23.26 mph (37.43 km/h) |
| 30 mph (48.28 km/h) | 27.91 mph (44.91 km/h) |
| 35 mph (56.33 km/h) | 32.56 mph (52.4 km/h) |
| 40 mph (64.37 km/h) | 37.21 mph (59.88 km/h) |
| 45 mph (72.42 km/h) | 41.86 mph (67.37 km/h) |
| 50 mph (80.47 km/h) | 46.51 mph (74.86 km/h) |
| 55 mph (88.51 km/h) | 51.16 mph (82.34 km/h) |
| 60 mph (96.56 km/h) | 55.82 mph (89.83 km/h) |
| 65 mph (104.61 km/h) | 60.47 mph (97.31 km/h) |
| 70 mph (112.65 km/h) | 65.12 mph (104.8 km/h) |
| 75 mph (120.7 km/h) | 69.77 mph (112.28 km/h) |
| 80 mph (128.75 km/h) | 74.42 mph (119.77 km/h) |
| 85 mph (136.79 km/h) | 79.07 mph (127.25 km/h) |
| 90 mph (144.84 km/h) | 83.72 mph (134.74 km/h) |
| 95 mph (152.89 km/h) | 88.37 mph (142.23 km/h) |
| 100 mph (160.93 km/h) | 93.03 mph (149.71 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1283 | 1491 | 1605 | 1676 | 1753 | 1808 | 1868 | 1939 | 2037 | 2135 | 2244 | 2332 | 2490 | 2665 | 2801 | 2889 | 2938 | 3118 | 3369 | 3915 |
Better Fuel Economy Factory Ratios Increased Power
