Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-21 | 225/45-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.1 (789.9) | 24.97 (634.3) | -6.13 (-155.6) -19.7% |
| Width inches (mm) | 11.22 (285) | 8.86 (225) | -2.36 (-60) -21.1% |
| Circum. inches (mm) | 97.7 (2481.54) | 78.45 (1992.71) | -19.25 (-488.83) -19.7% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 3.99 (101.25) | -1.06 (-27) -21.1% |
| Revolutions per mile (km) | 648.53 (402.97) | 807.61 (501.83) | 159.09 (98.85) 24.5% |
225/45-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.06 mph (25.85 km/h) |
| 25 mph (40.23 km/h) | 20.08 mph (32.31 km/h) |
| 30 mph (48.28 km/h) | 24.09 mph (38.77 km/h) |
| 35 mph (56.33 km/h) | 28.11 mph (45.23 km/h) |
| 40 mph (64.37 km/h) | 32.12 mph (51.69 km/h) |
| 45 mph (72.42 km/h) | 36.14 mph (58.15 km/h) |
| 50 mph (80.47 km/h) | 40.15 mph (64.62 km/h) |
| 55 mph (88.51 km/h) | 44.17 mph (71.08 km/h) |
| 60 mph (96.56 km/h) | 48.18 mph (77.54 km/h) |
| 65 mph (104.61 km/h) | 52.2 mph (84 km/h) |
| 70 mph (112.65 km/h) | 56.21 mph (90.46 km/h) |
| 75 mph (120.7 km/h) | 60.23 mph (96.92 km/h) |
| 80 mph (128.75 km/h) | 64.24 mph (103.39 km/h) |
| 85 mph (136.79 km/h) | 68.26 mph (109.85 km/h) |
| 90 mph (144.84 km/h) | 72.27 mph (116.31 km/h) |
| 95 mph (152.89 km/h) | 76.29 mph (122.77 km/h) |
| 100 mph (160.93 km/h) | 80.3 mph (129.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2055 | 2388 | 2571 | 2685 | 2807 | 2895 | 2991 | 3105 | 3262 | 3420 | 3594 | 3734 | 3988 | 4268 | 4487 | 4626 | 4705 | 4994 | 5396 | 6271 |
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