Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/45-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.62 (650.7) | 25.4 (645.2) | -0.22 (-5.5) -0.8% |
| Width inches (mm) | 8.46 (215) | 9.25 (235) | 0.79 (20) 9.3% |
| Circum. inches (mm) | 80.48 (2044.23) | 79.8 (2026.96) | -0.68 (-17.28) -0.8% |
| Sidewall Height inches (mm) | 3.81 (96.75) | 3.7 (94) | -0.11 (-2.75) -2.8% |
| Revolutions per mile (km) | 787.26 (489.18) | 793.97 (493.35) | 6.71 (4.17) 0.9% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.83 mph (31.91 km/h) |
| 25 mph (40.23 km/h) | 24.79 mph (39.89 km/h) |
| 30 mph (48.28 km/h) | 29.75 mph (47.87 km/h) |
| 35 mph (56.33 km/h) | 34.7 mph (55.85 km/h) |
| 40 mph (64.37 km/h) | 39.66 mph (63.83 km/h) |
| 45 mph (72.42 km/h) | 44.62 mph (71.81 km/h) |
| 50 mph (80.47 km/h) | 49.58 mph (79.79 km/h) |
| 55 mph (88.51 km/h) | 54.54 mph (87.77 km/h) |
| 60 mph (96.56 km/h) | 59.49 mph (95.74 km/h) |
| 65 mph (104.61 km/h) | 64.45 mph (103.72 km/h) |
| 70 mph (112.65 km/h) | 69.41 mph (111.7 km/h) |
| 75 mph (120.7 km/h) | 74.37 mph (119.68 km/h) |
| 80 mph (128.75 km/h) | 79.32 mph (127.66 km/h) |
| 85 mph (136.79 km/h) | 84.28 mph (135.64 km/h) |
| 90 mph (144.84 km/h) | 89.24 mph (143.62 km/h) |
| 95 mph (152.89 km/h) | 94.2 mph (151.6 km/h) |
| 100 mph (160.93 km/h) | 99.15 mph (159.57 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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