Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-17 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.13 (663.8) | 27.74 (704.7) | 1.61 (40.9) 6.2% |
| Width inches (mm) | 5.71 (145) | 8.86 (225) | 3.15 (80) 55.2% |
| Circum. inches (mm) | 82.1 (2085.39) | 87.16 (2213.88) | 5.06 (128.49) 6.2% |
| Sidewall Height inches (mm) | 4.57 (116) | 4.87 (123.75) | 0.31 (7.75) 6.7% |
| Revolutions per mile (km) | 771.72 (479.53) | 726.93 (451.69) | -44.79 (-27.83) -5.8% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.23 mph (34.17 km/h) |
| 25 mph (40.23 km/h) | 26.54 mph (42.71 km/h) |
| 30 mph (48.28 km/h) | 31.85 mph (51.26 km/h) |
| 35 mph (56.33 km/h) | 37.16 mph (59.8 km/h) |
| 40 mph (64.37 km/h) | 42.46 mph (68.34 km/h) |
| 45 mph (72.42 km/h) | 47.77 mph (76.88 km/h) |
| 50 mph (80.47 km/h) | 53.08 mph (85.43 km/h) |
| 55 mph (88.51 km/h) | 58.39 mph (93.97 km/h) |
| 60 mph (96.56 km/h) | 63.7 mph (102.51 km/h) |
| 65 mph (104.61 km/h) | 69 mph (111.05 km/h) |
| 70 mph (112.65 km/h) | 74.31 mph (119.6 km/h) |
| 75 mph (120.7 km/h) | 79.62 mph (128.14 km/h) |
| 80 mph (128.75 km/h) | 84.93 mph (136.68 km/h) |
| 85 mph (136.79 km/h) | 90.24 mph (145.22 km/h) |
| 90 mph (144.84 km/h) | 95.55 mph (153.77 km/h) |
| 95 mph (152.89 km/h) | 100.85 mph (162.31 km/h) |
| 100 mph (160.93 km/h) | 106.16 mph (170.85 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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