Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-18 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.18 (715.7) | 30.18 (766.5) | 2 (50.8) 7.1% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 88.52 (2248.44) | 94.8 (2408.03) | 6.28 (159.59) 7.1% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 5.09 (129.25) | 0 (0) 0% |
| Revolutions per mile (km) | 715.76 (444.75) | 668.32 (415.28) | -47.44 (-29.48) -6.6% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.42 mph (34.47 km/h) |
| 25 mph (40.23 km/h) | 26.77 mph (43.09 km/h) |
| 30 mph (48.28 km/h) | 32.13 mph (51.71 km/h) |
| 35 mph (56.33 km/h) | 37.48 mph (60.33 km/h) |
| 40 mph (64.37 km/h) | 42.84 mph (68.94 km/h) |
| 45 mph (72.42 km/h) | 48.19 mph (77.56 km/h) |
| 50 mph (80.47 km/h) | 53.55 mph (86.18 km/h) |
| 55 mph (88.51 km/h) | 58.9 mph (94.8 km/h) |
| 60 mph (96.56 km/h) | 64.26 mph (103.41 km/h) |
| 65 mph (104.61 km/h) | 69.61 mph (112.03 km/h) |
| 70 mph (112.65 km/h) | 74.97 mph (120.65 km/h) |
| 75 mph (120.7 km/h) | 80.32 mph (129.27 km/h) |
| 80 mph (128.75 km/h) | 85.68 mph (137.89 km/h) |
| 85 mph (136.79 km/h) | 91.03 mph (146.5 km/h) |
| 90 mph (144.84 km/h) | 96.39 mph (155.12 km/h) |
| 95 mph (152.89 km/h) | 101.74 mph (163.74 km/h) |
| 100 mph (160.93 km/h) | 107.1 mph (172.36 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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