Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/50-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.86 (682.2) | 25.09 (637.2) | -1.77 (-45) -6.6% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 84.38 (2143.19) | 78.81 (2001.82) | -5.57 (-141.37) -6.6% |
| Sidewall Height inches (mm) | 4.43 (112.5) | 3.54 (90) | -0.89 (-22.5) -20% |
| Revolutions per mile (km) | 750.91 (466.59) | 803.94 (499.54) | 53.03 (32.95) 7.1% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.68 mph (30.06 km/h) |
| 25 mph (40.23 km/h) | 23.35 mph (37.58 km/h) |
| 30 mph (48.28 km/h) | 28.02 mph (45.1 km/h) |
| 35 mph (56.33 km/h) | 32.69 mph (52.61 km/h) |
| 40 mph (64.37 km/h) | 37.36 mph (60.13 km/h) |
| 45 mph (72.42 km/h) | 42.03 mph (67.64 km/h) |
| 50 mph (80.47 km/h) | 46.7 mph (75.16 km/h) |
| 55 mph (88.51 km/h) | 51.37 mph (82.68 km/h) |
| 60 mph (96.56 km/h) | 56.04 mph (90.19 km/h) |
| 65 mph (104.61 km/h) | 60.71 mph (97.71 km/h) |
| 70 mph (112.65 km/h) | 65.38 mph (105.22 km/h) |
| 75 mph (120.7 km/h) | 70.05 mph (112.74 km/h) |
| 80 mph (128.75 km/h) | 74.72 mph (120.26 km/h) |
| 85 mph (136.79 km/h) | 79.39 mph (127.77 km/h) |
| 90 mph (144.84 km/h) | 84.06 mph (135.29 km/h) |
| 95 mph (152.89 km/h) | 88.73 mph (142.8 km/h) |
| 100 mph (160.93 km/h) | 93.4 mph (150.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2046 | 2377 | 2560 | 2673 | 2795 | 2882 | 2977 | 3091 | 3247 | 3404 | 3578 | 3717 | 3970 | 4248 | 4466 | 4605 | 4684 | 4971 | 5372 | 6242 |
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