Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-17 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.54 (648.8) | 27.74 (704.7) | 2.2 (55.9) 8.6% |
| Width inches (mm) | 6.1 (155) | 8.86 (225) | 2.76 (70) 45.2% |
| Circum. inches (mm) | 80.25 (2038.27) | 87.16 (2213.88) | 6.91 (175.62) 8.6% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 4.87 (123.75) | 0.6 (15.25) 14.1% |
| Revolutions per mile (km) | 789.57 (490.61) | 726.93 (451.69) | -62.63 (-38.92) -7.9% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.72 mph (34.96 km/h) |
| 25 mph (40.23 km/h) | 27.15 mph (43.7 km/h) |
| 30 mph (48.28 km/h) | 32.58 mph (52.44 km/h) |
| 35 mph (56.33 km/h) | 38.02 mph (61.18 km/h) |
| 40 mph (64.37 km/h) | 43.45 mph (69.92 km/h) |
| 45 mph (72.42 km/h) | 48.88 mph (78.66 km/h) |
| 50 mph (80.47 km/h) | 54.31 mph (87.4 km/h) |
| 55 mph (88.51 km/h) | 59.74 mph (96.14 km/h) |
| 60 mph (96.56 km/h) | 65.17 mph (104.88 km/h) |
| 65 mph (104.61 km/h) | 70.6 mph (113.62 km/h) |
| 70 mph (112.65 km/h) | 76.03 mph (122.36 km/h) |
| 75 mph (120.7 km/h) | 81.46 mph (131.1 km/h) |
| 80 mph (128.75 km/h) | 86.89 mph (139.84 km/h) |
| 85 mph (136.79 km/h) | 92.32 mph (148.58 km/h) |
| 90 mph (144.84 km/h) | 97.75 mph (157.32 km/h) |
| 95 mph (152.89 km/h) | 103.19 mph (166.06 km/h) |
| 100 mph (160.93 km/h) | 108.62 mph (174.8 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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