Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/55-20 | 255/80-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.34 (821.5) | 33.06 (839.8) | 0.72 (18.3) 2.2% |
| Width inches (mm) | 11.22 (285) | 10.04 (255) | -1.18 (-30) -10.5% |
| Circum. inches (mm) | 101.61 (2580.82) | 103.87 (2638.31) | 2.26 (57.49) 2.2% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 8.03 (204) | 1.86 (47.25) 30.1% |
| Revolutions per mile (km) | 623.58 (387.47) | 609.99 (379.03) | -13.59 (-8.44) -2.2% |
255/80-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.45 mph (32.9 km/h) |
| 25 mph (40.23 km/h) | 25.56 mph (41.13 km/h) |
| 30 mph (48.28 km/h) | 30.67 mph (49.36 km/h) |
| 35 mph (56.33 km/h) | 35.78 mph (57.58 km/h) |
| 40 mph (64.37 km/h) | 40.89 mph (65.81 km/h) |
| 45 mph (72.42 km/h) | 46 mph (74.03 km/h) |
| 50 mph (80.47 km/h) | 51.11 mph (82.26 km/h) |
| 55 mph (88.51 km/h) | 56.23 mph (90.49 km/h) |
| 60 mph (96.56 km/h) | 61.34 mph (98.71 km/h) |
| 65 mph (104.61 km/h) | 66.45 mph (106.94 km/h) |
| 70 mph (112.65 km/h) | 71.56 mph (115.16 km/h) |
| 75 mph (120.7 km/h) | 76.67 mph (123.39 km/h) |
| 80 mph (128.75 km/h) | 81.78 mph (131.62 km/h) |
| 85 mph (136.79 km/h) | 86.89 mph (139.84 km/h) |
| 90 mph (144.84 km/h) | 92 mph (148.07 km/h) |
| 95 mph (152.89 km/h) | 97.12 mph (156.29 km/h) |
| 100 mph (160.93 km/h) | 102.23 mph (164.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1552 | 1803 | 1942 | 2028 | 2120 | 2186 | 2259 | 2345 | 2464 | 2583 | 2715 | 2821 | 3012 | 3224 | 3389 | 3494 | 3554 | 3772 | 4076 | 4736 |
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