Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-20 | 320/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.41 (645.5) | 33.86 (860) | 8.44 (214.5) 33.2% |
| Width inches (mm) | 10.83 (275) | 12.6 (320) | 1.77 (45) 16.4% |
| Circum. inches (mm) | 79.84 (2027.9) | 106.37 (2701.77) | 26.53 (673.87) 33.2% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 6.93 (176) | 4.22 (107.25) 156% |
| Revolutions per mile (km) | 793.6 (493.12) | 595.66 (370.13) | -197.94 (-122.99) -24.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.65 mph (42.88 km/h) |
| 25 mph (40.23 km/h) | 33.31 mph (53.6 km/h) |
| 30 mph (48.28 km/h) | 39.97 mph (64.32 km/h) |
| 35 mph (56.33 km/h) | 46.63 mph (75.04 km/h) |
| 40 mph (64.37 km/h) | 53.29 mph (85.77 km/h) |
| 45 mph (72.42 km/h) | 59.95 mph (96.49 km/h) |
| 50 mph (80.47 km/h) | 66.62 mph (107.21 km/h) |
| 55 mph (88.51 km/h) | 73.28 mph (117.93 km/h) |
| 60 mph (96.56 km/h) | 79.94 mph (128.65 km/h) |
| 65 mph (104.61 km/h) | 86.6 mph (139.37 km/h) |
| 70 mph (112.65 km/h) | 93.26 mph (150.09 km/h) |
| 75 mph (120.7 km/h) | 99.92 mph (160.81 km/h) |
| 80 mph (128.75 km/h) | 106.58 mph (171.53 km/h) |
| 85 mph (136.79 km/h) | 113.25 mph (182.25 km/h) |
| 90 mph (144.84 km/h) | 119.91 mph (192.97 km/h) |
| 95 mph (152.89 km/h) | 126.57 mph (203.69 km/h) |
| 100 mph (160.93 km/h) | 133.23 mph (214.41 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1516 | 1761 | 1896 | 1980 | 2071 | 2135 | 2206 | 2290 | 2406 | 2522 | 2651 | 2754 | 2941 | 3148 | 3309 | 3412 | 3470 | 3683 | 3980 | 4625 |
Better Fuel Economy Factory Ratios Increased Power
