Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-18 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.72 (653.2) | 26.33 (668.7) | 0.61 (15.5) 2.4% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 80.79 (2052.09) | 82.71 (2100.78) | 1.92 (48.69) 2.4% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.16 (105.75) | 0.31 (7.75) 7.9% |
| Revolutions per mile (km) | 784.25 (487.31) | 766.07 (476.01) | -18.18 (-11.3) -2.3% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.47 mph (32.95 km/h) |
| 25 mph (40.23 km/h) | 25.59 mph (41.19 km/h) |
| 30 mph (48.28 km/h) | 30.71 mph (49.43 km/h) |
| 35 mph (56.33 km/h) | 35.83 mph (57.66 km/h) |
| 40 mph (64.37 km/h) | 40.95 mph (65.9 km/h) |
| 45 mph (72.42 km/h) | 46.07 mph (74.14 km/h) |
| 50 mph (80.47 km/h) | 51.19 mph (82.38 km/h) |
| 55 mph (88.51 km/h) | 56.31 mph (90.61 km/h) |
| 60 mph (96.56 km/h) | 61.42 mph (98.85 km/h) |
| 65 mph (104.61 km/h) | 66.54 mph (107.09 km/h) |
| 70 mph (112.65 km/h) | 71.66 mph (115.33 km/h) |
| 75 mph (120.7 km/h) | 76.78 mph (123.57 km/h) |
| 80 mph (128.75 km/h) | 81.9 mph (131.8 km/h) |
| 85 mph (136.79 km/h) | 87.02 mph (140.04 km/h) |
| 90 mph (144.84 km/h) | 92.14 mph (148.28 km/h) |
| 95 mph (152.89 km/h) | 97.25 mph (156.52 km/h) |
| 100 mph (160.93 km/h) | 102.37 mph (164.75 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
