Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/70-17 | 320/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.41 (543.8) | 40.16 (1020) | 18.75 (476.2) 87.6% |
| Width inches (mm) | 3.15 (80) | 12.6 (320) | 9.45 (240) 300% |
| Circum. inches (mm) | 67.26 (1708.4) | 126.16 (3204.42) | 58.9 (1496.03) 87.6% |
| Sidewall Height inches (mm) | 2.2 (56) | 10.08 (256) | 7.87 (200) 357.1% |
| Revolutions per mile (km) | 942.02 (585.34) | 502.23 (312.07) | -439.79 (-273.27) -46.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 37.51 mph (60.37 km/h) |
| 25 mph (40.23 km/h) | 46.89 mph (75.47 km/h) |
| 30 mph (48.28 km/h) | 56.27 mph (90.56 km/h) |
| 35 mph (56.33 km/h) | 65.65 mph (105.65 km/h) |
| 40 mph (64.37 km/h) | 75.03 mph (120.75 km/h) |
| 45 mph (72.42 km/h) | 84.41 mph (135.84 km/h) |
| 50 mph (80.47 km/h) | 93.78 mph (150.93 km/h) |
| 55 mph (88.51 km/h) | 103.16 mph (166.02 km/h) |
| 60 mph (96.56 km/h) | 112.54 mph (181.12 km/h) |
| 65 mph (104.61 km/h) | 121.92 mph (196.21 km/h) |
| 70 mph (112.65 km/h) | 131.3 mph (211.3 km/h) |
| 75 mph (120.7 km/h) | 140.68 mph (226.4 km/h) |
| 80 mph (128.75 km/h) | 150.06 mph (241.49 km/h) |
| 85 mph (136.79 km/h) | 159.43 mph (256.58 km/h) |
| 90 mph (144.84 km/h) | 168.81 mph (271.68 km/h) |
| 95 mph (152.89 km/h) | 178.19 mph (286.77 km/h) |
| 100 mph (160.93 km/h) | 187.57 mph (301.86 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
