Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-16 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.09 (586.4) | 25.09 (637.2) | 2 (50.8) 8.7% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 72.53 (1842.23) | 78.81 (2001.82) | 6.28 (159.59) 8.7% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.54 (90) | 0 (0) 0% |
| Revolutions per mile (km) | 873.58 (542.82) | 803.94 (499.54) | -69.65 (-43.28) -8% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.73 mph (34.98 km/h) |
| 25 mph (40.23 km/h) | 27.17 mph (43.72 km/h) |
| 30 mph (48.28 km/h) | 32.6 mph (52.46 km/h) |
| 35 mph (56.33 km/h) | 38.03 mph (61.21 km/h) |
| 40 mph (64.37 km/h) | 43.47 mph (69.95 km/h) |
| 45 mph (72.42 km/h) | 48.9 mph (78.69 km/h) |
| 50 mph (80.47 km/h) | 54.33 mph (87.44 km/h) |
| 55 mph (88.51 km/h) | 59.76 mph (96.18 km/h) |
| 60 mph (96.56 km/h) | 65.2 mph (104.93 km/h) |
| 65 mph (104.61 km/h) | 70.63 mph (113.67 km/h) |
| 70 mph (112.65 km/h) | 76.06 mph (122.41 km/h) |
| 75 mph (120.7 km/h) | 81.5 mph (131.16 km/h) |
| 80 mph (128.75 km/h) | 86.93 mph (139.9 km/h) |
| 85 mph (136.79 km/h) | 92.36 mph (148.65 km/h) |
| 90 mph (144.84 km/h) | 97.8 mph (157.39 km/h) |
| 95 mph (152.89 km/h) | 103.23 mph (166.13 km/h) |
| 100 mph (160.93 km/h) | 108.66 mph (174.88 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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