Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/55-20 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.34 (821.5) | 30.18 (766.5) | -2.17 (-55) -6.7% |
| Width inches (mm) | 11.22 (285) | 9.25 (235) | -1.97 (-50) -17.5% |
| Circum. inches (mm) | 101.61 (2580.82) | 94.8 (2408.03) | -6.8 (-172.79) -6.7% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 5.09 (129.25) | -1.08 (-27.5) -17.5% |
| Revolutions per mile (km) | 623.58 (387.47) | 668.32 (415.28) | 44.74 (27.8) 7.2% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.66 mph (30.03 km/h) |
| 25 mph (40.23 km/h) | 23.33 mph (37.54 km/h) |
| 30 mph (48.28 km/h) | 27.99 mph (45.05 km/h) |
| 35 mph (56.33 km/h) | 32.66 mph (52.56 km/h) |
| 40 mph (64.37 km/h) | 37.32 mph (60.06 km/h) |
| 45 mph (72.42 km/h) | 41.99 mph (67.57 km/h) |
| 50 mph (80.47 km/h) | 46.65 mph (75.08 km/h) |
| 55 mph (88.51 km/h) | 51.32 mph (82.59 km/h) |
| 60 mph (96.56 km/h) | 55.98 mph (90.1 km/h) |
| 65 mph (104.61 km/h) | 60.65 mph (97.6 km/h) |
| 70 mph (112.65 km/h) | 65.31 mph (105.11 km/h) |
| 75 mph (120.7 km/h) | 69.98 mph (112.62 km/h) |
| 80 mph (128.75 km/h) | 74.64 mph (120.13 km/h) |
| 85 mph (136.79 km/h) | 79.31 mph (127.64 km/h) |
| 90 mph (144.84 km/h) | 83.97 mph (135.14 km/h) |
| 95 mph (152.89 km/h) | 88.64 mph (142.65 km/h) |
| 100 mph (160.93 km/h) | 93.3 mph (150.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1701 | 1976 | 2128 | 2222 | 2323 | 2396 | 2475 | 2569 | 2699 | 2830 | 2975 | 3090 | 3300 | 3532 | 3713 | 3829 | 3894 | 4132 | 4465 | 5189 |
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