Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/50-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.46 (672.2) | 25.4 (645.2) | -1.06 (-27) -4% |
| Width inches (mm) | 8.46 (215) | 9.25 (235) | 0.79 (20) 9.3% |
| Circum. inches (mm) | 83.14 (2111.78) | 79.8 (2026.96) | -3.34 (-84.82) -4% |
| Sidewall Height inches (mm) | 4.23 (107.5) | 3.7 (94) | -0.53 (-13.5) -12.6% |
| Revolutions per mile (km) | 762.08 (473.53) | 793.97 (493.35) | 31.89 (19.82) 4.2% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.2 mph (30.89 km/h) |
| 25 mph (40.23 km/h) | 24 mph (38.62 km/h) |
| 30 mph (48.28 km/h) | 28.8 mph (46.34 km/h) |
| 35 mph (56.33 km/h) | 33.59 mph (54.06 km/h) |
| 40 mph (64.37 km/h) | 38.39 mph (61.79 km/h) |
| 45 mph (72.42 km/h) | 43.19 mph (69.51 km/h) |
| 50 mph (80.47 km/h) | 47.99 mph (77.24 km/h) |
| 55 mph (88.51 km/h) | 52.79 mph (84.96 km/h) |
| 60 mph (96.56 km/h) | 57.59 mph (92.68 km/h) |
| 65 mph (104.61 km/h) | 62.39 mph (100.41 km/h) |
| 70 mph (112.65 km/h) | 67.19 mph (108.13 km/h) |
| 75 mph (120.7 km/h) | 71.99 mph (115.85 km/h) |
| 80 mph (128.75 km/h) | 76.79 mph (123.58 km/h) |
| 85 mph (136.79 km/h) | 81.59 mph (131.3 km/h) |
| 90 mph (144.84 km/h) | 86.39 mph (139.02 km/h) |
| 95 mph (152.89 km/h) | 91.18 mph (146.75 km/h) |
| 100 mph (160.93 km/h) | 95.98 mph (154.47 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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