Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 170/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 26.03 (661.2) | 0.24 (6) 0.9% |
| Width inches (mm) | 7.09 (180) | 6.69 (170) | -0.39 (-10) -5.6% |
| Circum. inches (mm) | 81.04 (2058.37) | 81.78 (2077.22) | 0.74 (18.85) 0.9% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.02 (102) | 0.12 (3) 3% |
| Revolutions per mile (km) | 781.85 (485.82) | 774.76 (481.41) | -7.09 (-4.41) -0.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.18 mph (32.48 km/h) |
| 25 mph (40.23 km/h) | 25.23 mph (40.6 km/h) |
| 30 mph (48.28 km/h) | 30.27 mph (48.72 km/h) |
| 35 mph (56.33 km/h) | 35.32 mph (56.84 km/h) |
| 40 mph (64.37 km/h) | 40.37 mph (64.96 km/h) |
| 45 mph (72.42 km/h) | 45.41 mph (73.08 km/h) |
| 50 mph (80.47 km/h) | 50.46 mph (81.2 km/h) |
| 55 mph (88.51 km/h) | 55.5 mph (89.32 km/h) |
| 60 mph (96.56 km/h) | 60.55 mph (97.45 km/h) |
| 65 mph (104.61 km/h) | 65.6 mph (105.57 km/h) |
| 70 mph (112.65 km/h) | 70.64 mph (113.69 km/h) |
| 75 mph (120.7 km/h) | 75.69 mph (121.81 km/h) |
| 80 mph (128.75 km/h) | 80.73 mph (129.93 km/h) |
| 85 mph (136.79 km/h) | 85.78 mph (138.05 km/h) |
| 90 mph (144.84 km/h) | 90.82 mph (146.17 km/h) |
| 95 mph (152.89 km/h) | 95.87 mph (154.29 km/h) |
| 100 mph (160.93 km/h) | 100.92 mph (162.41 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1972 | 2290 | 2467 | 2576 | 2693 | 2777 | 2869 | 2978 | 3129 | 3280 | 3448 | 3582 | 3826 | 4094 | 4304 | 4438 | 4514 | 4791 | 5177 | 6016 |
Better Fuel Economy Factory Ratios Increased Power
