Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-18 | 225/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 26.86 (682.2) | 1.77 (45) 7.1% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 78.81 (2001.82) | 84.38 (2143.19) | 5.57 (141.37) 7.1% |
| Sidewall Height inches (mm) | 3.54 (90) | 4.43 (112.5) | 0.89 (22.5) 25% |
| Revolutions per mile (km) | 803.94 (499.54) | 750.91 (466.59) | -53.03 (-32.95) -6.6% |
225/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.41 mph (34.46 km/h) |
| 25 mph (40.23 km/h) | 26.77 mph (43.08 km/h) |
| 30 mph (48.28 km/h) | 32.12 mph (51.69 km/h) |
| 35 mph (56.33 km/h) | 37.47 mph (60.31 km/h) |
| 40 mph (64.37 km/h) | 42.82 mph (68.92 km/h) |
| 45 mph (72.42 km/h) | 48.18 mph (77.54 km/h) |
| 50 mph (80.47 km/h) | 53.53 mph (86.15 km/h) |
| 55 mph (88.51 km/h) | 58.88 mph (94.77 km/h) |
| 60 mph (96.56 km/h) | 64.24 mph (103.38 km/h) |
| 65 mph (104.61 km/h) | 69.59 mph (112 km/h) |
| 70 mph (112.65 km/h) | 74.94 mph (120.61 km/h) |
| 75 mph (120.7 km/h) | 80.3 mph (129.23 km/h) |
| 80 mph (128.75 km/h) | 85.65 mph (137.84 km/h) |
| 85 mph (136.79 km/h) | 91 mph (146.46 km/h) |
| 90 mph (144.84 km/h) | 96.36 mph (155.07 km/h) |
| 95 mph (152.89 km/h) | 101.71 mph (163.69 km/h) |
| 100 mph (160.93 km/h) | 107.06 mph (172.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1911 | 2220 | 2391 | 2496 | 2610 | 2692 | 2781 | 2887 | 3033 | 3179 | 3342 | 3472 | 3708 | 3968 | 4171 | 4302 | 4375 | 4643 | 5017 | 5830 |
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