Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/70-15 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.85 (682) | 25.09 (637.2) | -1.76 (-44.8) -6.6% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 84.35 (2142.57) | 78.81 (2001.82) | -5.54 (-140.74) -6.6% |
| Sidewall Height inches (mm) | 5.93 (150.5) | 3.54 (90) | -2.38 (-60.5) -40.2% |
| Revolutions per mile (km) | 751.13 (466.73) | 803.94 (499.54) | 52.81 (32.81) 7% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.69 mph (30.07 km/h) |
| 25 mph (40.23 km/h) | 23.36 mph (37.59 km/h) |
| 30 mph (48.28 km/h) | 28.03 mph (45.11 km/h) |
| 35 mph (56.33 km/h) | 32.7 mph (52.63 km/h) |
| 40 mph (64.37 km/h) | 37.37 mph (60.15 km/h) |
| 45 mph (72.42 km/h) | 42.04 mph (67.66 km/h) |
| 50 mph (80.47 km/h) | 46.72 mph (75.18 km/h) |
| 55 mph (88.51 km/h) | 51.39 mph (82.7 km/h) |
| 60 mph (96.56 km/h) | 56.06 mph (90.22 km/h) |
| 65 mph (104.61 km/h) | 60.73 mph (97.74 km/h) |
| 70 mph (112.65 km/h) | 65.4 mph (105.25 km/h) |
| 75 mph (120.7 km/h) | 70.07 mph (112.77 km/h) |
| 80 mph (128.75 km/h) | 74.74 mph (120.29 km/h) |
| 85 mph (136.79 km/h) | 79.42 mph (127.81 km/h) |
| 90 mph (144.84 km/h) | 84.09 mph (135.33 km/h) |
| 95 mph (152.89 km/h) | 88.76 mph (142.84 km/h) |
| 100 mph (160.93 km/h) | 93.43 mph (150.36 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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