Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/80-18 | 120/100-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 27.45 (697.2) | 1.89 (48) 7.4% |
| Width inches (mm) | 4.72 (120) | 4.72 (120) | 0 (0) 0% |
| Circum. inches (mm) | 80.3 (2039.52) | 86.23 (2190.32) | 5.94 (150.8) 7.4% |
| Sidewall Height inches (mm) | 3.78 (96) | 4.72 (120) | 0.94 (24) 25% |
| Revolutions per mile (km) | 789.08 (490.31) | 734.75 (456.55) | -54.33 (-33.76) -6.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.48 mph (34.57 km/h) |
| 25 mph (40.23 km/h) | 26.85 mph (43.21 km/h) |
| 30 mph (48.28 km/h) | 32.22 mph (51.85 km/h) |
| 35 mph (56.33 km/h) | 37.59 mph (60.49 km/h) |
| 40 mph (64.37 km/h) | 42.96 mph (69.13 km/h) |
| 45 mph (72.42 km/h) | 48.33 mph (77.78 km/h) |
| 50 mph (80.47 km/h) | 53.7 mph (86.42 km/h) |
| 55 mph (88.51 km/h) | 59.07 mph (95.06 km/h) |
| 60 mph (96.56 km/h) | 64.44 mph (103.7 km/h) |
| 65 mph (104.61 km/h) | 69.81 mph (112.34 km/h) |
| 70 mph (112.65 km/h) | 75.18 mph (120.98 km/h) |
| 75 mph (120.7 km/h) | 80.55 mph (129.63 km/h) |
| 80 mph (128.75 km/h) | 85.91 mph (138.27 km/h) |
| 85 mph (136.79 km/h) | 91.28 mph (146.91 km/h) |
| 90 mph (144.84 km/h) | 96.65 mph (155.55 km/h) |
| 95 mph (152.89 km/h) | 102.02 mph (164.19 km/h) |
| 100 mph (160.93 km/h) | 107.39 mph (172.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1870 | 2172 | 2339 | 2443 | 2554 | 2634 | 2721 | 2825 | 2968 | 3111 | 3270 | 3397 | 3628 | 3883 | 4082 | 4209 | 4281 | 4543 | 4909 | 5705 |
Better Fuel Economy Factory Ratios Increased Power
