Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/80-18 | 180/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 29.34 (745.2) | 3.78 (96) 14.8% |
| Width inches (mm) | 4.72 (120) | 7.09 (180) | 2.36 (60) 50% |
| Circum. inches (mm) | 80.3 (2039.52) | 92.17 (2341.11) | 11.87 (301.59) 14.8% |
| Sidewall Height inches (mm) | 3.78 (96) | 5.67 (144) | 1.89 (48) 50% |
| Revolutions per mile (km) | 789.08 (490.31) | 687.43 (427.15) | -101.65 (-63.16) -12.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.96 mph (36.95 km/h) |
| 25 mph (40.23 km/h) | 28.7 mph (46.18 km/h) |
| 30 mph (48.28 km/h) | 34.44 mph (55.42 km/h) |
| 35 mph (56.33 km/h) | 40.18 mph (64.66 km/h) |
| 40 mph (64.37 km/h) | 45.91 mph (73.89 km/h) |
| 45 mph (72.42 km/h) | 51.65 mph (83.13 km/h) |
| 50 mph (80.47 km/h) | 57.39 mph (92.37 km/h) |
| 55 mph (88.51 km/h) | 63.13 mph (101.6 km/h) |
| 60 mph (96.56 km/h) | 68.87 mph (110.84 km/h) |
| 65 mph (104.61 km/h) | 74.61 mph (120.08 km/h) |
| 70 mph (112.65 km/h) | 80.35 mph (129.31 km/h) |
| 75 mph (120.7 km/h) | 86.09 mph (138.55 km/h) |
| 80 mph (128.75 km/h) | 91.83 mph (147.79 km/h) |
| 85 mph (136.79 km/h) | 97.57 mph (157.02 km/h) |
| 90 mph (144.84 km/h) | 103.31 mph (166.26 km/h) |
| 95 mph (152.89 km/h) | 109.05 mph (175.5 km/h) |
| 100 mph (160.93 km/h) | 114.79 mph (184.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1749 | 2032 | 2189 | 2285 | 2390 | 2464 | 2546 | 2643 | 2777 | 2911 | 3060 | 3179 | 3395 | 3633 | 3819 | 3938 | 4005 | 4251 | 4593 | 5337 |
Better Fuel Economy Factory Ratios Increased Power
