Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/50-17 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.46 (646.8) | 25.97 (659.7) | 0.51 (12.9) 2% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 80 (2031.98) | 81.59 (2072.51) | 1.6 (40.53) 2% |
| Sidewall Height inches (mm) | 4.23 (107.5) | 3.99 (101.25) | -0.25 (-6.25) -5.8% |
| Revolutions per mile (km) | 792.01 (492.13) | 776.52 (482.51) | -15.49 (-9.62) -2% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.83 km/h) |
| 25 mph (40.23 km/h) | 25.5 mph (41.04 km/h) |
| 30 mph (48.28 km/h) | 30.6 mph (49.24 km/h) |
| 35 mph (56.33 km/h) | 35.7 mph (57.45 km/h) |
| 40 mph (64.37 km/h) | 40.8 mph (65.66 km/h) |
| 45 mph (72.42 km/h) | 45.9 mph (73.87 km/h) |
| 50 mph (80.47 km/h) | 51 mph (82.07 km/h) |
| 55 mph (88.51 km/h) | 56.1 mph (90.28 km/h) |
| 60 mph (96.56 km/h) | 61.2 mph (98.49 km/h) |
| 65 mph (104.61 km/h) | 66.3 mph (106.69 km/h) |
| 70 mph (112.65 km/h) | 71.4 mph (114.9 km/h) |
| 75 mph (120.7 km/h) | 76.5 mph (123.11 km/h) |
| 80 mph (128.75 km/h) | 81.6 mph (131.32 km/h) |
| 85 mph (136.79 km/h) | 86.7 mph (139.52 km/h) |
| 90 mph (144.84 km/h) | 91.79 mph (147.73 km/h) |
| 95 mph (152.89 km/h) | 96.89 mph (155.94 km/h) |
| 100 mph (160.93 km/h) | 101.99 mph (164.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1976 | 2296 | 2472 | 2582 | 2699 | 2783 | 2876 | 2985 | 3137 | 3288 | 3456 | 3591 | 3834 | 4104 | 4314 | 4448 | 4524 | 4801 | 5188 | 6029 |
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