Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/60-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.63 (727.2) | 25.09 (637.2) | -3.54 (-90) -12.4% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 89.94 (2284.57) | 78.81 (2001.82) | -11.13 (-282.74) -12.4% |
| Sidewall Height inches (mm) | 5.31 (135) | 3.54 (90) | -1.77 (-45) -33.3% |
| Revolutions per mile (km) | 704.44 (437.72) | 803.94 (499.54) | 99.5 (61.82) 14.1% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.52 mph (28.2 km/h) |
| 25 mph (40.23 km/h) | 21.91 mph (35.25 km/h) |
| 30 mph (48.28 km/h) | 26.29 mph (42.31 km/h) |
| 35 mph (56.33 km/h) | 30.67 mph (49.36 km/h) |
| 40 mph (64.37 km/h) | 35.05 mph (56.41 km/h) |
| 45 mph (72.42 km/h) | 39.43 mph (63.46 km/h) |
| 50 mph (80.47 km/h) | 43.81 mph (70.51 km/h) |
| 55 mph (88.51 km/h) | 48.19 mph (77.56 km/h) |
| 60 mph (96.56 km/h) | 52.57 mph (84.61 km/h) |
| 65 mph (104.61 km/h) | 56.96 mph (91.66 km/h) |
| 70 mph (112.65 km/h) | 61.34 mph (98.71 km/h) |
| 75 mph (120.7 km/h) | 65.72 mph (105.76 km/h) |
| 80 mph (128.75 km/h) | 70.1 mph (112.81 km/h) |
| 85 mph (136.79 km/h) | 74.48 mph (119.86 km/h) |
| 90 mph (144.84 km/h) | 78.86 mph (126.92 km/h) |
| 95 mph (152.89 km/h) | 83.24 mph (133.97 km/h) |
| 100 mph (160.93 km/h) | 87.62 mph (141.02 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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