Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 180/55-16 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 23.8 (604.4) | -2 (-50.8) -7.8% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 81.04 (2058.37) | 74.76 (1898.78) | -6.28 (-159.59) -7.8% |
| Sidewall Height inches (mm) | 3.9 (99) | 3.9 (99) | 0 (0) 0% |
| Revolutions per mile (km) | 781.85 (485.82) | 847.57 (526.65) | 65.71 (40.83) 8.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.45 mph (29.69 km/h) |
| 25 mph (40.23 km/h) | 23.06 mph (37.11 km/h) |
| 30 mph (48.28 km/h) | 27.67 mph (44.54 km/h) |
| 35 mph (56.33 km/h) | 32.29 mph (51.96 km/h) |
| 40 mph (64.37 km/h) | 36.9 mph (59.38 km/h) |
| 45 mph (72.42 km/h) | 41.51 mph (66.81 km/h) |
| 50 mph (80.47 km/h) | 46.12 mph (74.23 km/h) |
| 55 mph (88.51 km/h) | 50.74 mph (81.65 km/h) |
| 60 mph (96.56 km/h) | 55.35 mph (89.07 km/h) |
| 65 mph (104.61 km/h) | 59.96 mph (96.5 km/h) |
| 70 mph (112.65 km/h) | 64.57 mph (103.92 km/h) |
| 75 mph (120.7 km/h) | 69.18 mph (111.34 km/h) |
| 80 mph (128.75 km/h) | 73.8 mph (118.77 km/h) |
| 85 mph (136.79 km/h) | 78.41 mph (126.19 km/h) |
| 90 mph (144.84 km/h) | 83.02 mph (133.61 km/h) |
| 95 mph (152.89 km/h) | 87.63 mph (141.03 km/h) |
| 100 mph (160.93 km/h) | 92.25 mph (148.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2157 | 2506 | 2698 | 2818 | 2946 | 3038 | 3139 | 3258 | 3424 | 3589 | 3772 | 3919 | 4185 | 4479 | 4708 | 4855 | 4938 | 5241 | 5663 | 6581 |
Better Fuel Economy Factory Ratios Increased Power
