Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-17 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.13 (663.8) | 26.33 (668.7) | 0.19 (4.9) 0.7% |
| Width inches (mm) | 5.71 (145) | 9.25 (235) | 3.54 (90) 62.1% |
| Circum. inches (mm) | 82.1 (2085.39) | 82.71 (2100.78) | 0.61 (15.39) 0.7% |
| Sidewall Height inches (mm) | 4.57 (116) | 4.16 (105.75) | -0.4 (-10.25) -8.8% |
| Revolutions per mile (km) | 771.72 (479.53) | 766.07 (476.01) | -5.65 (-3.51) -0.7% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.15 mph (32.42 km/h) |
| 25 mph (40.23 km/h) | 25.18 mph (40.53 km/h) |
| 30 mph (48.28 km/h) | 30.22 mph (48.64 km/h) |
| 35 mph (56.33 km/h) | 35.26 mph (56.74 km/h) |
| 40 mph (64.37 km/h) | 40.3 mph (64.85 km/h) |
| 45 mph (72.42 km/h) | 45.33 mph (72.96 km/h) |
| 50 mph (80.47 km/h) | 50.37 mph (81.06 km/h) |
| 55 mph (88.51 km/h) | 55.41 mph (89.17 km/h) |
| 60 mph (96.56 km/h) | 60.44 mph (97.27 km/h) |
| 65 mph (104.61 km/h) | 65.48 mph (105.38 km/h) |
| 70 mph (112.65 km/h) | 70.52 mph (113.49 km/h) |
| 75 mph (120.7 km/h) | 75.55 mph (121.59 km/h) |
| 80 mph (128.75 km/h) | 80.59 mph (129.7 km/h) |
| 85 mph (136.79 km/h) | 85.63 mph (137.8 km/h) |
| 90 mph (144.84 km/h) | 90.66 mph (145.91 km/h) |
| 95 mph (152.89 km/h) | 95.7 mph (154.02 km/h) |
| 100 mph (160.93 km/h) | 100.74 mph (162.12 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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