Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/45-15 | 180/55-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.2 (538.5) | 22.8 (579) | 1.59 (40.5) 7.5% |
| Width inches (mm) | 6.89 (175) | 7.09 (180) | 0.2 (5) 2.9% |
| Circum. inches (mm) | 66.6 (1691.75) | 71.61 (1818.98) | 5.01 (127.23) 7.5% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 3.9 (99) | 0.8 (20.25) 25.7% |
| Revolutions per mile (km) | 951.29 (591.1) | 884.75 (549.76) | -66.54 (-41.35) -7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.5 mph (34.61 km/h) |
| 25 mph (40.23 km/h) | 26.88 mph (43.26 km/h) |
| 30 mph (48.28 km/h) | 32.26 mph (51.91 km/h) |
| 35 mph (56.33 km/h) | 37.63 mph (60.56 km/h) |
| 40 mph (64.37 km/h) | 43.01 mph (69.22 km/h) |
| 45 mph (72.42 km/h) | 48.38 mph (77.87 km/h) |
| 50 mph (80.47 km/h) | 53.76 mph (86.52 km/h) |
| 55 mph (88.51 km/h) | 59.14 mph (95.17 km/h) |
| 60 mph (96.56 km/h) | 64.51 mph (103.82 km/h) |
| 65 mph (104.61 km/h) | 69.89 mph (112.47 km/h) |
| 70 mph (112.65 km/h) | 75.26 mph (121.13 km/h) |
| 75 mph (120.7 km/h) | 80.64 mph (129.78 km/h) |
| 80 mph (128.75 km/h) | 86.02 mph (138.43 km/h) |
| 85 mph (136.79 km/h) | 91.39 mph (147.08 km/h) |
| 90 mph (144.84 km/h) | 96.77 mph (155.73 km/h) |
| 95 mph (152.89 km/h) | 102.14 mph (164.39 km/h) |
| 100 mph (160.93 km/h) | 107.52 mph (173.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2252 | 2616 | 2817 | 2941 | 3075 | 3171 | 3277 | 3401 | 3574 | 3746 | 3938 | 4091 | 4369 | 4675 | 4915 | 5068 | 5155 | 5471 | 5911 | 6870 |
Better Fuel Economy Factory Ratios Increased Power
