Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 27.74 (704.7) | 4.19 (106.5) 17.8% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 73.99 (1879.3) | 87.16 (2213.88) | 13.17 (334.58) 17.8% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 4.87 (123.75) | 2.1 (53.25) 75.5% |
| Revolutions per mile (km) | 856.35 (532.11) | 726.93 (451.69) | -129.42 (-80.42) -15.1% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.56 mph (37.92 km/h) |
| 25 mph (40.23 km/h) | 29.45 mph (47.4 km/h) |
| 30 mph (48.28 km/h) | 35.34 mph (56.88 km/h) |
| 35 mph (56.33 km/h) | 41.23 mph (66.36 km/h) |
| 40 mph (64.37 km/h) | 47.12 mph (75.83 km/h) |
| 45 mph (72.42 km/h) | 53.01 mph (85.31 km/h) |
| 50 mph (80.47 km/h) | 58.9 mph (94.79 km/h) |
| 55 mph (88.51 km/h) | 64.79 mph (104.27 km/h) |
| 60 mph (96.56 km/h) | 70.68 mph (113.75 km/h) |
| 65 mph (104.61 km/h) | 76.57 mph (123.23 km/h) |
| 70 mph (112.65 km/h) | 82.46 mph (132.71 km/h) |
| 75 mph (120.7 km/h) | 88.35 mph (142.19 km/h) |
| 80 mph (128.75 km/h) | 94.24 mph (151.67 km/h) |
| 85 mph (136.79 km/h) | 100.13 mph (161.15 km/h) |
| 90 mph (144.84 km/h) | 106.02 mph (170.63 km/h) |
| 95 mph (152.89 km/h) | 111.91 mph (180.11 km/h) |
| 100 mph (160.93 km/h) | 117.8 mph (189.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1850 | 2149 | 2314 | 2417 | 2527 | 2606 | 2692 | 2795 | 2936 | 3078 | 3235 | 3361 | 3590 | 3842 | 4038 | 4164 | 4235 | 4495 | 4857 | 5644 |
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