Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/55-17 | 185/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.58 (624.3) | 24.56 (623.7) | -0.02 (-0.6) -0.1% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 77.22 (1961.3) | 77.14 (1959.41) | -0.07 (-1.88) -0.1% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 3.28 (83.25) | -0.51 (-13) -13.5% |
| Revolutions per mile (km) | 820.55 (509.87) | 821.34 (510.36) | 0.79 (0.49) 0.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.98 mph (32.16 km/h) |
| 25 mph (40.23 km/h) | 24.98 mph (40.2 km/h) |
| 30 mph (48.28 km/h) | 29.97 mph (48.23 km/h) |
| 35 mph (56.33 km/h) | 34.97 mph (56.27 km/h) |
| 40 mph (64.37 km/h) | 39.96 mph (64.31 km/h) |
| 45 mph (72.42 km/h) | 44.96 mph (72.35 km/h) |
| 50 mph (80.47 km/h) | 49.95 mph (80.39 km/h) |
| 55 mph (88.51 km/h) | 54.95 mph (88.43 km/h) |
| 60 mph (96.56 km/h) | 59.94 mph (96.47 km/h) |
| 65 mph (104.61 km/h) | 64.94 mph (104.51 km/h) |
| 70 mph (112.65 km/h) | 69.93 mph (112.55 km/h) |
| 75 mph (120.7 km/h) | 74.93 mph (120.59 km/h) |
| 80 mph (128.75 km/h) | 79.92 mph (128.62 km/h) |
| 85 mph (136.79 km/h) | 84.92 mph (136.66 km/h) |
| 90 mph (144.84 km/h) | 89.91 mph (144.7 km/h) |
| 95 mph (152.89 km/h) | 94.91 mph (152.74 km/h) |
| 100 mph (160.93 km/h) | 99.9 mph (160.78 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2090 | 2428 | 2615 | 2731 | 2855 | 2944 | 3042 | 3157 | 3318 | 3478 | 3656 | 3798 | 4056 | 4340 | 4563 | 4705 | 4785 | 5079 | 5488 | 6377 |
Better Fuel Economy Factory Ratios Increased Power
