Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 180/55-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 24.8 (629.8) | -1 (-25.4) -3.9% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 81.04 (2058.37) | 77.9 (1978.58) | -3.14 (-79.8) -3.9% |
| Sidewall Height inches (mm) | 3.9 (99) | 3.9 (99) | 0 (0) 0% |
| Revolutions per mile (km) | 781.85 (485.82) | 813.39 (505.41) | 31.53 (19.59) 4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.22 mph (30.94 km/h) |
| 25 mph (40.23 km/h) | 24.03 mph (38.67 km/h) |
| 30 mph (48.28 km/h) | 28.84 mph (46.41 km/h) |
| 35 mph (56.33 km/h) | 33.64 mph (54.14 km/h) |
| 40 mph (64.37 km/h) | 38.45 mph (61.88 km/h) |
| 45 mph (72.42 km/h) | 43.26 mph (69.61 km/h) |
| 50 mph (80.47 km/h) | 48.06 mph (77.35 km/h) |
| 55 mph (88.51 km/h) | 52.87 mph (85.08 km/h) |
| 60 mph (96.56 km/h) | 57.67 mph (92.82 km/h) |
| 65 mph (104.61 km/h) | 62.48 mph (100.55 km/h) |
| 70 mph (112.65 km/h) | 67.29 mph (108.29 km/h) |
| 75 mph (120.7 km/h) | 72.09 mph (116.02 km/h) |
| 80 mph (128.75 km/h) | 76.9 mph (123.76 km/h) |
| 85 mph (136.79 km/h) | 81.7 mph (131.49 km/h) |
| 90 mph (144.84 km/h) | 86.51 mph (139.23 km/h) |
| 95 mph (152.89 km/h) | 91.32 mph (146.96 km/h) |
| 100 mph (160.93 km/h) | 96.12 mph (154.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2070 | 2405 | 2590 | 2704 | 2827 | 2915 | 3012 | 3127 | 3285 | 3444 | 3620 | 3761 | 4017 | 4298 | 4519 | 4660 | 4739 | 5029 | 5435 | 6315 |
Better Fuel Economy Factory Ratios Increased Power
