Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 27.74 (704.7) | 1.2 (30.5) 4.5% |
| Width inches (mm) | 6.1 (155) | 8.86 (225) | 2.76 (70) 45.2% |
| Circum. inches (mm) | 83.39 (2118.06) | 87.16 (2213.88) | 3.77 (95.82) 4.5% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 4.87 (123.75) | 0.6 (15.25) 14.1% |
| Revolutions per mile (km) | 759.82 (472.13) | 726.93 (451.69) | -32.89 (-20.43) -4.3% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.9 mph (33.64 km/h) |
| 25 mph (40.23 km/h) | 26.13 mph (42.05 km/h) |
| 30 mph (48.28 km/h) | 31.36 mph (50.46 km/h) |
| 35 mph (56.33 km/h) | 36.58 mph (58.88 km/h) |
| 40 mph (64.37 km/h) | 41.81 mph (67.29 km/h) |
| 45 mph (72.42 km/h) | 47.04 mph (75.7 km/h) |
| 50 mph (80.47 km/h) | 52.26 mph (84.11 km/h) |
| 55 mph (88.51 km/h) | 57.49 mph (92.52 km/h) |
| 60 mph (96.56 km/h) | 62.71 mph (100.93 km/h) |
| 65 mph (104.61 km/h) | 67.94 mph (109.34 km/h) |
| 70 mph (112.65 km/h) | 73.17 mph (117.75 km/h) |
| 75 mph (120.7 km/h) | 78.39 mph (126.16 km/h) |
| 80 mph (128.75 km/h) | 83.62 mph (134.57 km/h) |
| 85 mph (136.79 km/h) | 88.85 mph (142.98 km/h) |
| 90 mph (144.84 km/h) | 94.07 mph (151.39 km/h) |
| 95 mph (152.89 km/h) | 99.3 mph (159.8 km/h) |
| 100 mph (160.93 km/h) | 104.52 mph (168.22 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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