Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 365/80-20 | 40/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 42.99 (1092) | 39.99 (1015.64) | -3.01 (-76.36) -7% |
| Width inches (mm) | 14.37 (365) | 13.5 (343) | -0.87 (-22) -6% |
| Circum. inches (mm) | 135.06 (3430.62) | 125.62 (3190.73) | -9.44 (-239.89) -7% |
| Sidewall Height inches (mm) | 11.5 (292) | 9.99 (253.82) | -1.5 (-38.18) -13.1% |
| Revolutions per mile (km) | 469.11 (291.49) | 504.38 (313.41) | 35.27 (21.92) 7.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.6 mph (29.94 km/h) |
| 25 mph (40.23 km/h) | 23.25 mph (37.42 km/h) |
| 30 mph (48.28 km/h) | 27.9 mph (44.9 km/h) |
| 35 mph (56.33 km/h) | 32.55 mph (52.39 km/h) |
| 40 mph (64.37 km/h) | 37.2 mph (59.87 km/h) |
| 45 mph (72.42 km/h) | 41.85 mph (67.36 km/h) |
| 50 mph (80.47 km/h) | 46.5 mph (74.84 km/h) |
| 55 mph (88.51 km/h) | 51.15 mph (82.32 km/h) |
| 60 mph (96.56 km/h) | 55.8 mph (89.81 km/h) |
| 65 mph (104.61 km/h) | 60.45 mph (97.29 km/h) |
| 70 mph (112.65 km/h) | 65.11 mph (104.78 km/h) |
| 75 mph (120.7 km/h) | 69.76 mph (112.26 km/h) |
| 80 mph (128.75 km/h) | 74.41 mph (119.74 km/h) |
| 85 mph (136.79 km/h) | 79.06 mph (127.23 km/h) |
| 90 mph (144.84 km/h) | 83.71 mph (134.71 km/h) |
| 95 mph (152.89 km/h) | 88.36 mph (142.2 km/h) |
| 100 mph (160.93 km/h) | 93.01 mph (149.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1284 | 1491 | 1606 | 1677 | 1753 | 1808 | 1868 | 1939 | 2037 | 2136 | 2245 | 2332 | 2491 | 2665 | 2802 | 2889 | 2939 | 3119 | 3370 | 3916 |
Better Fuel Economy Factory Ratios Increased Power
