Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 365/80-20 | 320/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 42.99 (1092) | 40.16 (1020) | -2.83 (-72) -6.6% |
| Width inches (mm) | 14.37 (365) | 12.6 (320) | -1.77 (-45) -12.3% |
| Circum. inches (mm) | 135.06 (3430.62) | 126.16 (3204.42) | -8.91 (-226.19) -6.6% |
| Sidewall Height inches (mm) | 11.5 (292) | 10.08 (256) | -1.42 (-36) -12.3% |
| Revolutions per mile (km) | 469.11 (291.49) | 502.23 (312.07) | 33.11 (20.58) 7.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.68 mph (30.06 km/h) |
| 25 mph (40.23 km/h) | 23.35 mph (37.58 km/h) |
| 30 mph (48.28 km/h) | 28.02 mph (45.1 km/h) |
| 35 mph (56.33 km/h) | 32.69 mph (52.61 km/h) |
| 40 mph (64.37 km/h) | 37.36 mph (60.13 km/h) |
| 45 mph (72.42 km/h) | 42.03 mph (67.65 km/h) |
| 50 mph (80.47 km/h) | 46.7 mph (75.16 km/h) |
| 55 mph (88.51 km/h) | 51.37 mph (82.68 km/h) |
| 60 mph (96.56 km/h) | 56.04 mph (90.19 km/h) |
| 65 mph (104.61 km/h) | 60.71 mph (97.71 km/h) |
| 70 mph (112.65 km/h) | 65.38 mph (105.23 km/h) |
| 75 mph (120.7 km/h) | 70.05 mph (112.74 km/h) |
| 80 mph (128.75 km/h) | 74.73 mph (120.26 km/h) |
| 85 mph (136.79 km/h) | 79.4 mph (127.78 km/h) |
| 90 mph (144.84 km/h) | 84.07 mph (135.29 km/h) |
| 95 mph (152.89 km/h) | 88.74 mph (142.81 km/h) |
| 100 mph (160.93 km/h) | 93.41 mph (150.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1278 | 1485 | 1599 | 1670 | 1746 | 1800 | 1860 | 1931 | 2029 | 2126 | 2235 | 2322 | 2480 | 2654 | 2790 | 2877 | 2926 | 3105 | 3356 | 3899 |
Better Fuel Economy Factory Ratios Increased Power
