Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/70-15 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.3 (668) | 27.74 (704.7) | 1.44 (36.7) 5.5% |
| Width inches (mm) | 8.07 (205) | 8.86 (225) | 0.79 (20) 9.8% |
| Circum. inches (mm) | 82.62 (2098.58) | 87.16 (2213.88) | 4.54 (115.3) 5.5% |
| Sidewall Height inches (mm) | 5.65 (143.5) | 4.87 (123.75) | -0.78 (-19.75) -13.8% |
| Revolutions per mile (km) | 766.87 (476.51) | 726.93 (451.69) | -39.94 (-24.82) -5.2% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.1 mph (33.96 km/h) |
| 25 mph (40.23 km/h) | 26.37 mph (42.44 km/h) |
| 30 mph (48.28 km/h) | 31.65 mph (50.93 km/h) |
| 35 mph (56.33 km/h) | 36.92 mph (59.42 km/h) |
| 40 mph (64.37 km/h) | 42.2 mph (67.91 km/h) |
| 45 mph (72.42 km/h) | 47.47 mph (76.4 km/h) |
| 50 mph (80.47 km/h) | 52.75 mph (84.89 km/h) |
| 55 mph (88.51 km/h) | 58.02 mph (93.38 km/h) |
| 60 mph (96.56 km/h) | 63.3 mph (101.87 km/h) |
| 65 mph (104.61 km/h) | 68.57 mph (110.35 km/h) |
| 70 mph (112.65 km/h) | 73.85 mph (118.84 km/h) |
| 75 mph (120.7 km/h) | 79.12 mph (127.33 km/h) |
| 80 mph (128.75 km/h) | 84.4 mph (135.82 km/h) |
| 85 mph (136.79 km/h) | 89.67 mph (144.31 km/h) |
| 90 mph (144.84 km/h) | 94.94 mph (152.8 km/h) |
| 95 mph (152.89 km/h) | 100.22 mph (161.29 km/h) |
| 100 mph (160.93 km/h) | 105.49 mph (169.78 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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