Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-20 | 325/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.41 (645.5) | 32.07 (814.7) | 6.66 (169.2) 26.2% |
| Width inches (mm) | 10.83 (275) | 12.8 (325) | 1.97 (50) 18.2% |
| Circum. inches (mm) | 79.84 (2027.9) | 100.77 (2559.46) | 20.93 (531.56) 26.2% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 7.04 (178.75) | 4.33 (110) 160% |
| Revolutions per mile (km) | 793.6 (493.12) | 628.78 (390.71) | -164.82 (-102.41) -20.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.24 mph (40.62 km/h) |
| 25 mph (40.23 km/h) | 31.55 mph (50.78 km/h) |
| 30 mph (48.28 km/h) | 37.86 mph (60.94 km/h) |
| 35 mph (56.33 km/h) | 44.17 mph (71.09 km/h) |
| 40 mph (64.37 km/h) | 50.48 mph (81.25 km/h) |
| 45 mph (72.42 km/h) | 56.8 mph (91.4 km/h) |
| 50 mph (80.47 km/h) | 63.11 mph (101.56 km/h) |
| 55 mph (88.51 km/h) | 69.42 mph (111.72 km/h) |
| 60 mph (96.56 km/h) | 75.73 mph (121.87 km/h) |
| 65 mph (104.61 km/h) | 82.04 mph (132.03 km/h) |
| 70 mph (112.65 km/h) | 88.35 mph (142.18 km/h) |
| 75 mph (120.7 km/h) | 94.66 mph (152.34 km/h) |
| 80 mph (128.75 km/h) | 100.97 mph (162.5 km/h) |
| 85 mph (136.79 km/h) | 107.28 mph (172.65 km/h) |
| 90 mph (144.84 km/h) | 113.59 mph (182.81 km/h) |
| 95 mph (152.89 km/h) | 119.9 mph (192.96 km/h) |
| 100 mph (160.93 km/h) | 126.21 mph (203.12 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 | 1859 | 2002 | 2090 | 2186 | 2254 | 2329 | 2417 | 2540 | 2662 | 2799 | 2907 | 3105 | 3323 | 3493 | 3602 | 3663 | 3888 | 4201 | 4882 |
Better Fuel Economy Factory Ratios Increased Power
