Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-17 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.33 (643.3) | 25.4 (645.2) | 0.07 (1.9) 0.3% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 79.57 (2020.99) | 79.8 (2026.96) | 0.24 (5.97) 0.3% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 3.7 (94) | -0.46 (-11.75) -11.1% |
| Revolutions per mile (km) | 796.32 (494.81) | 793.97 (493.35) | -2.35 (-1.46) -0.3% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.06 mph (32.28 km/h) |
| 25 mph (40.23 km/h) | 25.07 mph (40.35 km/h) |
| 30 mph (48.28 km/h) | 30.09 mph (48.42 km/h) |
| 35 mph (56.33 km/h) | 35.1 mph (56.49 km/h) |
| 40 mph (64.37 km/h) | 40.12 mph (64.56 km/h) |
| 45 mph (72.42 km/h) | 45.13 mph (72.63 km/h) |
| 50 mph (80.47 km/h) | 50.15 mph (80.71 km/h) |
| 55 mph (88.51 km/h) | 55.16 mph (88.78 km/h) |
| 60 mph (96.56 km/h) | 60.18 mph (96.85 km/h) |
| 65 mph (104.61 km/h) | 65.19 mph (104.92 km/h) |
| 70 mph (112.65 km/h) | 70.21 mph (112.99 km/h) |
| 75 mph (120.7 km/h) | 75.22 mph (121.06 km/h) |
| 80 mph (128.75 km/h) | 80.24 mph (129.13 km/h) |
| 85 mph (136.79 km/h) | 85.25 mph (137.2 km/h) |
| 90 mph (144.84 km/h) | 90.27 mph (145.27 km/h) |
| 95 mph (152.89 km/h) | 95.28 mph (153.34 km/h) |
| 100 mph (160.93 km/h) | 100.3 mph (161.41 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 2347 | 2528 | 2640 | 2760 | 2846 | 2940 | 3052 | 3207 | 3362 | 3534 | 3671 | 3921 | 4196 | 4411 | 4548 | 4626 | 4909 | 5305 | 6165 |
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