Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 365/80-20 | 42/14.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 42.99 (1092) | 42.02 (1067.36) | -0.97 (-24.64) -2.3% |
| Width inches (mm) | 14.37 (365) | 14.49 (368) | 0.12 (3) 0.8% |
| Circum. inches (mm) | 135.06 (3430.62) | 132.02 (3353.21) | -3.05 (-77.41) -2.3% |
| Sidewall Height inches (mm) | 11.5 (292) | 11.01 (279.68) | -0.49 (-12.32) -4.2% |
| Revolutions per mile (km) | 469.11 (291.49) | 479.94 (298.22) | 10.83 (6.73) 2.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.55 mph (31.46 km/h) |
| 25 mph (40.23 km/h) | 24.44 mph (39.33 km/h) |
| 30 mph (48.28 km/h) | 29.32 mph (47.19 km/h) |
| 35 mph (56.33 km/h) | 34.21 mph (55.06 km/h) |
| 40 mph (64.37 km/h) | 39.1 mph (62.92 km/h) |
| 45 mph (72.42 km/h) | 43.98 mph (70.79 km/h) |
| 50 mph (80.47 km/h) | 48.87 mph (78.65 km/h) |
| 55 mph (88.51 km/h) | 53.76 mph (86.52 km/h) |
| 60 mph (96.56 km/h) | 58.65 mph (94.38 km/h) |
| 65 mph (104.61 km/h) | 63.53 mph (102.25 km/h) |
| 70 mph (112.65 km/h) | 68.42 mph (110.11 km/h) |
| 75 mph (120.7 km/h) | 73.31 mph (117.98 km/h) |
| 80 mph (128.75 km/h) | 78.19 mph (125.84 km/h) |
| 85 mph (136.79 km/h) | 83.08 mph (133.71 km/h) |
| 90 mph (144.84 km/h) | 87.97 mph (141.57 km/h) |
| 95 mph (152.89 km/h) | 92.86 mph (149.44 km/h) |
| 100 mph (160.93 km/h) | 97.74 mph (157.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1221 | 1419 | 1528 | 1596 | 1668 | 1720 | 1777 | 1845 | 1939 | 2032 | 2136 | 2219 | 2370 | 2536 | 2666 | 2749 | 2796 | 2968 | 3207 | 3726 |
Better Fuel Economy Factory Ratios Increased Power
