Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 25.97 (659.7) | 2.42 (61.5) 10.3% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 73.99 (1879.3) | 81.59 (2072.51) | 7.61 (193.21) 10.3% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 3.99 (101.25) | 1.21 (30.75) 43.6% |
| Revolutions per mile (km) | 856.35 (532.11) | 776.52 (482.51) | -79.83 (-49.61) -9.3% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.06 mph (35.5 km/h) |
| 25 mph (40.23 km/h) | 27.57 mph (44.37 km/h) |
| 30 mph (48.28 km/h) | 33.08 mph (53.24 km/h) |
| 35 mph (56.33 km/h) | 38.6 mph (62.12 km/h) |
| 40 mph (64.37 km/h) | 44.11 mph (70.99 km/h) |
| 45 mph (72.42 km/h) | 49.63 mph (79.87 km/h) |
| 50 mph (80.47 km/h) | 55.14 mph (88.74 km/h) |
| 55 mph (88.51 km/h) | 60.65 mph (97.61 km/h) |
| 60 mph (96.56 km/h) | 66.17 mph (106.49 km/h) |
| 65 mph (104.61 km/h) | 71.68 mph (115.36 km/h) |
| 70 mph (112.65 km/h) | 77.2 mph (124.24 km/h) |
| 75 mph (120.7 km/h) | 82.71 mph (133.11 km/h) |
| 80 mph (128.75 km/h) | 88.22 mph (141.98 km/h) |
| 85 mph (136.79 km/h) | 93.74 mph (150.86 km/h) |
| 90 mph (144.84 km/h) | 99.25 mph (159.73 km/h) |
| 95 mph (152.89 km/h) | 104.77 mph (168.61 km/h) |
| 100 mph (160.93 km/h) | 110.28 mph (177.48 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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