Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/80-17 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.87 (631.8) | 27.74 (704.7) | 2.87 (72.9) 11.5% |
| Width inches (mm) | 4.92 (125) | 8.86 (225) | 3.94 (100) 80% |
| Circum. inches (mm) | 78.14 (1984.86) | 87.16 (2213.88) | 9.02 (229.02) 11.5% |
| Sidewall Height inches (mm) | 3.94 (100) | 4.87 (123.75) | 0.94 (23.75) 23.8% |
| Revolutions per mile (km) | 810.81 (503.81) | 726.93 (451.69) | -83.88 (-52.12) -10.3% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.31 mph (35.9 km/h) |
| 25 mph (40.23 km/h) | 27.88 mph (44.88 km/h) |
| 30 mph (48.28 km/h) | 33.46 mph (53.85 km/h) |
| 35 mph (56.33 km/h) | 39.04 mph (62.83 km/h) |
| 40 mph (64.37 km/h) | 44.62 mph (71.8 km/h) |
| 45 mph (72.42 km/h) | 50.19 mph (80.78 km/h) |
| 50 mph (80.47 km/h) | 55.77 mph (89.75 km/h) |
| 55 mph (88.51 km/h) | 61.35 mph (98.73 km/h) |
| 60 mph (96.56 km/h) | 66.92 mph (107.7 km/h) |
| 65 mph (104.61 km/h) | 72.5 mph (116.68 km/h) |
| 70 mph (112.65 km/h) | 78.08 mph (125.65 km/h) |
| 75 mph (120.7 km/h) | 83.65 mph (134.63 km/h) |
| 80 mph (128.75 km/h) | 89.23 mph (143.6 km/h) |
| 85 mph (136.79 km/h) | 94.81 mph (152.58 km/h) |
| 90 mph (144.84 km/h) | 100.38 mph (161.55 km/h) |
| 95 mph (152.89 km/h) | 105.96 mph (170.53 km/h) |
| 100 mph (160.93 km/h) | 111.54 mph (179.5 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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