Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-17 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.33 (643.3) | 30.18 (766.5) | 4.85 (123.2) 19.2% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 79.57 (2020.99) | 94.8 (2408.03) | 15.24 (387.04) 19.2% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 5.09 (129.25) | 0.93 (23.5) 22.2% |
| Revolutions per mile (km) | 796.32 (494.81) | 668.32 (415.28) | -127.99 (-79.53) -16.1% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.83 mph (38.35 km/h) |
| 25 mph (40.23 km/h) | 29.79 mph (47.94 km/h) |
| 30 mph (48.28 km/h) | 35.75 mph (57.53 km/h) |
| 35 mph (56.33 km/h) | 41.7 mph (67.11 km/h) |
| 40 mph (64.37 km/h) | 47.66 mph (76.7 km/h) |
| 45 mph (72.42 km/h) | 53.62 mph (86.29 km/h) |
| 50 mph (80.47 km/h) | 59.58 mph (95.88 km/h) |
| 55 mph (88.51 km/h) | 65.53 mph (105.47 km/h) |
| 60 mph (96.56 km/h) | 71.49 mph (115.05 km/h) |
| 65 mph (104.61 km/h) | 77.45 mph (124.64 km/h) |
| 70 mph (112.65 km/h) | 83.41 mph (134.23 km/h) |
| 75 mph (120.7 km/h) | 89.36 mph (143.82 km/h) |
| 80 mph (128.75 km/h) | 95.32 mph (153.4 km/h) |
| 85 mph (136.79 km/h) | 101.28 mph (162.99 km/h) |
| 90 mph (144.84 km/h) | 107.24 mph (172.58 km/h) |
| 95 mph (152.89 km/h) | 113.19 mph (182.17 km/h) |
| 100 mph (160.93 km/h) | 119.15 mph (191.76 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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