Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/70-15 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.3 (668) | 26.33 (668.7) | 0.03 (0.7) 0.1% |
| Width inches (mm) | 8.07 (205) | 9.25 (235) | 1.18 (30) 14.6% |
| Circum. inches (mm) | 82.62 (2098.58) | 82.71 (2100.78) | 0.09 (2.2) 0.1% |
| Sidewall Height inches (mm) | 5.65 (143.5) | 4.16 (105.75) | -1.49 (-37.75) -26.3% |
| Revolutions per mile (km) | 766.87 (476.51) | 766.07 (476.01) | -0.8 (-0.5) -0.1% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.02 mph (32.22 km/h) |
| 25 mph (40.23 km/h) | 25.03 mph (40.28 km/h) |
| 30 mph (48.28 km/h) | 30.03 mph (48.33 km/h) |
| 35 mph (56.33 km/h) | 35.04 mph (56.39 km/h) |
| 40 mph (64.37 km/h) | 40.04 mph (64.44 km/h) |
| 45 mph (72.42 km/h) | 45.05 mph (72.5 km/h) |
| 50 mph (80.47 km/h) | 50.05 mph (80.55 km/h) |
| 55 mph (88.51 km/h) | 55.06 mph (88.61 km/h) |
| 60 mph (96.56 km/h) | 60.06 mph (96.66 km/h) |
| 65 mph (104.61 km/h) | 65.07 mph (104.72 km/h) |
| 70 mph (112.65 km/h) | 70.07 mph (112.77 km/h) |
| 75 mph (120.7 km/h) | 75.08 mph (120.83 km/h) |
| 80 mph (128.75 km/h) | 80.08 mph (128.88 km/h) |
| 85 mph (136.79 km/h) | 85.09 mph (136.94 km/h) |
| 90 mph (144.84 km/h) | 90.09 mph (144.99 km/h) |
| 95 mph (152.89 km/h) | 95.1 mph (153.05 km/h) |
| 100 mph (160.93 km/h) | 100.1 mph (161.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1949 | 2265 | 2439 | 2547 | 2663 | 2746 | 2837 | 2945 | 3094 | 3244 | 3410 | 3542 | 3783 | 4048 | 4256 | 4388 | 4463 | 4737 | 5118 | 5948 |
Better Fuel Economy Factory Ratios Increased Power
