Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 225/55-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 26.74 (679.3) | -0.04 (-1.1) -0.2% |
| Width inches (mm) | 9.65 (245) | 8.86 (225) | -0.79 (-20) -8.2% |
| Circum. inches (mm) | 84.16 (2137.54) | 84.02 (2134.08) | -0.14 (-3.46) -0.2% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 4.87 (123.75) | 1.98 (50.25) 68.4% |
| Revolutions per mile (km) | 752.9 (467.83) | 754.11 (468.58) | 1.22 (0.76) 0.2% |
225/55-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.97 mph (32.13 km/h) |
| 25 mph (40.23 km/h) | 24.96 mph (40.17 km/h) |
| 30 mph (48.28 km/h) | 29.95 mph (48.2 km/h) |
| 35 mph (56.33 km/h) | 34.94 mph (56.24 km/h) |
| 40 mph (64.37 km/h) | 39.94 mph (64.27 km/h) |
| 45 mph (72.42 km/h) | 44.93 mph (72.3 km/h) |
| 50 mph (80.47 km/h) | 49.92 mph (80.34 km/h) |
| 55 mph (88.51 km/h) | 54.91 mph (88.37 km/h) |
| 60 mph (96.56 km/h) | 59.9 mph (96.4 km/h) |
| 65 mph (104.61 km/h) | 64.89 mph (104.44 km/h) |
| 70 mph (112.65 km/h) | 69.89 mph (112.47 km/h) |
| 75 mph (120.7 km/h) | 74.88 mph (120.51 km/h) |
| 80 mph (128.75 km/h) | 79.87 mph (128.54 km/h) |
| 85 mph (136.79 km/h) | 84.86 mph (136.57 km/h) |
| 90 mph (144.84 km/h) | 89.85 mph (144.61 km/h) |
| 95 mph (152.89 km/h) | 94.85 mph (152.64 km/h) |
| 100 mph (160.93 km/h) | 99.84 mph (160.67 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1919 | 2229 | 2401 | 2507 | 2621 | 2703 | 2793 | 2899 | 3046 | 3193 | 3356 | 3487 | 3724 | 3985 | 4189 | 4320 | 4393 | 4663 | 5039 | 5855 |
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