Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/80-17 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.76 (679.8) | 25.97 (659.7) | -0.79 (-20.1) -3% |
| Width inches (mm) | 6.1 (155) | 8.86 (225) | 2.76 (70) 45.2% |
| Circum. inches (mm) | 84.08 (2135.65) | 81.59 (2072.51) | -2.49 (-63.15) -3% |
| Sidewall Height inches (mm) | 4.88 (124) | 3.99 (101.25) | -0.9 (-22.75) -18.3% |
| Revolutions per mile (km) | 753.56 (468.24) | 776.52 (482.51) | 22.96 (14.27) 3% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.41 mph (31.24 km/h) |
| 25 mph (40.23 km/h) | 24.26 mph (39.04 km/h) |
| 30 mph (48.28 km/h) | 29.11 mph (46.85 km/h) |
| 35 mph (56.33 km/h) | 33.97 mph (54.66 km/h) |
| 40 mph (64.37 km/h) | 38.82 mph (62.47 km/h) |
| 45 mph (72.42 km/h) | 43.67 mph (70.28 km/h) |
| 50 mph (80.47 km/h) | 48.52 mph (78.09 km/h) |
| 55 mph (88.51 km/h) | 53.37 mph (85.9 km/h) |
| 60 mph (96.56 km/h) | 58.23 mph (93.71 km/h) |
| 65 mph (104.61 km/h) | 63.08 mph (101.51 km/h) |
| 70 mph (112.65 km/h) | 67.93 mph (109.32 km/h) |
| 75 mph (120.7 km/h) | 72.78 mph (117.13 km/h) |
| 80 mph (128.75 km/h) | 77.63 mph (124.94 km/h) |
| 85 mph (136.79 km/h) | 82.49 mph (132.75 km/h) |
| 90 mph (144.84 km/h) | 87.34 mph (140.56 km/h) |
| 95 mph (152.89 km/h) | 92.19 mph (148.37 km/h) |
| 100 mph (160.93 km/h) | 97.04 mph (156.18 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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