Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/90-16 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.28 (667.4) | 28.18 (715.7) | 1.9 (48.3) 7.2% |
| Width inches (mm) | 5.71 (145) | 9.25 (235) | 3.54 (90) 62.1% |
| Circum. inches (mm) | 82.55 (2096.7) | 88.52 (2248.44) | 5.97 (151.74) 7.2% |
| Sidewall Height inches (mm) | 5.14 (130.5) | 5.09 (129.25) | -0.05 (-1.25) -1% |
| Revolutions per mile (km) | 767.56 (476.94) | 715.76 (444.75) | -51.8 (-32.19) -6.7% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.45 mph (34.52 km/h) |
| 25 mph (40.23 km/h) | 26.81 mph (43.15 km/h) |
| 30 mph (48.28 km/h) | 32.17 mph (51.77 km/h) |
| 35 mph (56.33 km/h) | 37.53 mph (60.4 km/h) |
| 40 mph (64.37 km/h) | 42.89 mph (69.03 km/h) |
| 45 mph (72.42 km/h) | 48.26 mph (77.66 km/h) |
| 50 mph (80.47 km/h) | 53.62 mph (86.29 km/h) |
| 55 mph (88.51 km/h) | 58.98 mph (94.92 km/h) |
| 60 mph (96.56 km/h) | 64.34 mph (103.55 km/h) |
| 65 mph (104.61 km/h) | 69.7 mph (112.18 km/h) |
| 70 mph (112.65 km/h) | 75.07 mph (120.81 km/h) |
| 75 mph (120.7 km/h) | 80.43 mph (129.44 km/h) |
| 80 mph (128.75 km/h) | 85.79 mph (138.07 km/h) |
| 85 mph (136.79 km/h) | 91.15 mph (146.69 km/h) |
| 90 mph (144.84 km/h) | 96.51 mph (155.32 km/h) |
| 95 mph (152.89 km/h) | 101.88 mph (163.95 km/h) |
| 100 mph (160.93 km/h) | 107.24 mph (172.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1821 | 2116 | 2279 | 2380 | 2488 | 2566 | 2651 | 2752 | 2891 | 3031 | 3186 | 3310 | 3534 | 3782 | 3976 | 4100 | 4170 | 4426 | 4782 | 5557 |
Better Fuel Economy Factory Ratios Increased Power
