Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 27.74 (704.7) | -1.24 (-31.5) -4.3% |
| Width inches (mm) | 6.1 (155) | 8.86 (225) | 2.76 (70) 45.2% |
| Circum. inches (mm) | 91.06 (2312.84) | 87.16 (2213.88) | -3.9 (-98.96) -4.3% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.87 (123.75) | -0.62 (-15.75) -11.3% |
| Revolutions per mile (km) | 695.83 (432.37) | 726.93 (451.69) | 31.1 (19.33) 4.5% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.14 mph (30.81 km/h) |
| 25 mph (40.23 km/h) | 23.93 mph (38.51 km/h) |
| 30 mph (48.28 km/h) | 28.72 mph (46.21 km/h) |
| 35 mph (56.33 km/h) | 33.5 mph (53.92 km/h) |
| 40 mph (64.37 km/h) | 38.29 mph (61.62 km/h) |
| 45 mph (72.42 km/h) | 43.07 mph (69.32 km/h) |
| 50 mph (80.47 km/h) | 47.86 mph (77.02 km/h) |
| 55 mph (88.51 km/h) | 52.65 mph (84.73 km/h) |
| 60 mph (96.56 km/h) | 57.43 mph (92.43 km/h) |
| 65 mph (104.61 km/h) | 62.22 mph (100.13 km/h) |
| 70 mph (112.65 km/h) | 67 mph (107.83 km/h) |
| 75 mph (120.7 km/h) | 71.79 mph (115.54 km/h) |
| 80 mph (128.75 km/h) | 76.58 mph (123.24 km/h) |
| 85 mph (136.79 km/h) | 81.36 mph (130.94 km/h) |
| 90 mph (144.84 km/h) | 86.15 mph (138.64 km/h) |
| 95 mph (152.89 km/h) | 90.94 mph (146.35 km/h) |
| 100 mph (160.93 km/h) | 95.72 mph (154.05 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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