Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.97 (659.7) | 25.4 (645.2) | -0.57 (-14.5) -2.2% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 81.59 (2072.51) | 79.8 (2026.96) | -1.79 (-45.55) -2.2% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 3.7 (94) | -0.29 (-7.25) -7.2% |
| Revolutions per mile (km) | 776.52 (482.51) | 793.97 (493.35) | 17.45 (10.84) 2.2% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.56 mph (31.48 km/h) |
| 25 mph (40.23 km/h) | 24.45 mph (39.35 km/h) |
| 30 mph (48.28 km/h) | 29.34 mph (47.22 km/h) |
| 35 mph (56.33 km/h) | 34.23 mph (55.09 km/h) |
| 40 mph (64.37 km/h) | 39.12 mph (62.96 km/h) |
| 45 mph (72.42 km/h) | 44.01 mph (70.83 km/h) |
| 50 mph (80.47 km/h) | 48.9 mph (78.7 km/h) |
| 55 mph (88.51 km/h) | 53.79 mph (86.57 km/h) |
| 60 mph (96.56 km/h) | 58.68 mph (94.44 km/h) |
| 65 mph (104.61 km/h) | 63.57 mph (102.31 km/h) |
| 70 mph (112.65 km/h) | 68.46 mph (110.18 km/h) |
| 75 mph (120.7 km/h) | 73.35 mph (118.05 km/h) |
| 80 mph (128.75 km/h) | 78.24 mph (125.92 km/h) |
| 85 mph (136.79 km/h) | 83.13 mph (133.79 km/h) |
| 90 mph (144.84 km/h) | 88.02 mph (141.66 km/h) |
| 95 mph (152.89 km/h) | 92.91 mph (149.53 km/h) |
| 100 mph (160.93 km/h) | 97.8 mph (157.4 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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