Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-20 | 225/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.5) | 27.74 (704.7) | -0.23 (-5.8) -0.8% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 87.88 (2232.1) | 87.16 (2213.88) | -0.72 (-18.22) -0.8% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 4.87 (123.75) | 0.89 (22.5) 22.2% |
| Revolutions per mile (km) | 721 (448.01) | 726.93 (451.69) | 5.93 (3.69) 0.8% |
225/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.84 mph (31.92 km/h) |
| 25 mph (40.23 km/h) | 24.8 mph (39.91 km/h) |
| 30 mph (48.28 km/h) | 29.76 mph (47.89 km/h) |
| 35 mph (56.33 km/h) | 34.71 mph (55.87 km/h) |
| 40 mph (64.37 km/h) | 39.67 mph (63.85 km/h) |
| 45 mph (72.42 km/h) | 44.63 mph (71.83 km/h) |
| 50 mph (80.47 km/h) | 49.59 mph (79.81 km/h) |
| 55 mph (88.51 km/h) | 54.55 mph (87.79 km/h) |
| 60 mph (96.56 km/h) | 59.51 mph (95.77 km/h) |
| 65 mph (104.61 km/h) | 64.47 mph (103.75 km/h) |
| 70 mph (112.65 km/h) | 69.43 mph (111.73 km/h) |
| 75 mph (120.7 km/h) | 74.39 mph (119.72 km/h) |
| 80 mph (128.75 km/h) | 79.35 mph (127.7 km/h) |
| 85 mph (136.79 km/h) | 84.31 mph (135.68 km/h) |
| 90 mph (144.84 km/h) | 89.27 mph (143.66 km/h) |
| 95 mph (152.89 km/h) | 94.22 mph (151.64 km/h) |
| 100 mph (160.93 km/h) | 99.18 mph (159.62 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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