Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-18 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.18 (715.7) | 26.33 (668.7) | -1.85 (-47) -6.6% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 88.52 (2248.44) | 82.71 (2100.78) | -5.81 (-147.65) -6.6% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 4.16 (105.75) | -0.93 (-23.5) -18.2% |
| Revolutions per mile (km) | 715.76 (444.75) | 766.07 (476.01) | 50.31 (31.26) 7% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.69 mph (30.07 km/h) |
| 25 mph (40.23 km/h) | 23.36 mph (37.59 km/h) |
| 30 mph (48.28 km/h) | 28.03 mph (45.11 km/h) |
| 35 mph (56.33 km/h) | 32.7 mph (52.63 km/h) |
| 40 mph (64.37 km/h) | 37.37 mph (60.15 km/h) |
| 45 mph (72.42 km/h) | 42.04 mph (67.66 km/h) |
| 50 mph (80.47 km/h) | 46.72 mph (75.18 km/h) |
| 55 mph (88.51 km/h) | 51.39 mph (82.7 km/h) |
| 60 mph (96.56 km/h) | 56.06 mph (90.22 km/h) |
| 65 mph (104.61 km/h) | 60.73 mph (97.74 km/h) |
| 70 mph (112.65 km/h) | 65.4 mph (105.26 km/h) |
| 75 mph (120.7 km/h) | 70.07 mph (112.77 km/h) |
| 80 mph (128.75 km/h) | 74.75 mph (120.29 km/h) |
| 85 mph (136.79 km/h) | 79.42 mph (127.81 km/h) |
| 90 mph (144.84 km/h) | 84.09 mph (135.33 km/h) |
| 95 mph (152.89 km/h) | 88.76 mph (142.85 km/h) |
| 100 mph (160.93 km/h) | 93.43 mph (150.37 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 |
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