Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 185/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 24.56 (623.7) | -1.44 (-36.5) -5.5% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 81.66 (2074.08) | 77.14 (1959.41) | -4.51 (-114.67) -5.5% |
| Sidewall Height inches (mm) | 4 (101.5) | 3.28 (83.25) | -0.72 (-18.25) -18% |
| Revolutions per mile (km) | 775.93 (482.14) | 821.34 (510.36) | 45.41 (28.22) 5.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.89 mph (30.41 km/h) |
| 25 mph (40.23 km/h) | 23.62 mph (38.01 km/h) |
| 30 mph (48.28 km/h) | 28.34 mph (45.61 km/h) |
| 35 mph (56.33 km/h) | 33.06 mph (53.21 km/h) |
| 40 mph (64.37 km/h) | 37.79 mph (60.81 km/h) |
| 45 mph (72.42 km/h) | 42.51 mph (68.42 km/h) |
| 50 mph (80.47 km/h) | 47.24 mph (76.02 km/h) |
| 55 mph (88.51 km/h) | 51.96 mph (83.62 km/h) |
| 60 mph (96.56 km/h) | 56.68 mph (91.22 km/h) |
| 65 mph (104.61 km/h) | 61.41 mph (98.82 km/h) |
| 70 mph (112.65 km/h) | 66.13 mph (106.43 km/h) |
| 75 mph (120.7 km/h) | 70.85 mph (114.03 km/h) |
| 80 mph (128.75 km/h) | 75.58 mph (121.63 km/h) |
| 85 mph (136.79 km/h) | 80.3 mph (129.23 km/h) |
| 90 mph (144.84 km/h) | 85.02 mph (136.83 km/h) |
| 95 mph (152.89 km/h) | 89.75 mph (144.44 km/h) |
| 100 mph (160.93 km/h) | 94.47 mph (152.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
