Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 27.74 (704.7) | 0.04 (1) 0.1% |
| Width inches (mm) | 5.71 (145) | 8.86 (225) | 3.15 (80) 55.2% |
| Circum. inches (mm) | 87.04 (2210.74) | 87.16 (2213.88) | 0.12 (3.14) 0.1% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 4.87 (123.75) | 0.02 (0.5) 0.4% |
| Revolutions per mile (km) | 727.97 (452.34) | 726.93 (451.69) | -1.03 (-0.64) -0.1% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.03 mph (32.23 km/h) |
| 25 mph (40.23 km/h) | 25.04 mph (40.29 km/h) |
| 30 mph (48.28 km/h) | 30.04 mph (48.35 km/h) |
| 35 mph (56.33 km/h) | 35.05 mph (56.41 km/h) |
| 40 mph (64.37 km/h) | 40.06 mph (64.47 km/h) |
| 45 mph (72.42 km/h) | 45.06 mph (72.52 km/h) |
| 50 mph (80.47 km/h) | 50.07 mph (80.58 km/h) |
| 55 mph (88.51 km/h) | 55.08 mph (88.64 km/h) |
| 60 mph (96.56 km/h) | 60.09 mph (96.7 km/h) |
| 65 mph (104.61 km/h) | 65.09 mph (104.76 km/h) |
| 70 mph (112.65 km/h) | 70.1 mph (112.81 km/h) |
| 75 mph (120.7 km/h) | 75.11 mph (120.87 km/h) |
| 80 mph (128.75 km/h) | 80.11 mph (128.93 km/h) |
| 85 mph (136.79 km/h) | 85.12 mph (136.99 km/h) |
| 90 mph (144.84 km/h) | 90.13 mph (145.05 km/h) |
| 95 mph (152.89 km/h) | 95.14 mph (153.11 km/h) |
| 100 mph (160.93 km/h) | 100.14 mph (161.16 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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