Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/65-20 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.59 (878.5) | 30.18 (766.5) | -4.41 (-112) -12.7% |
| Width inches (mm) | 11.22 (285) | 9.25 (235) | -1.97 (-50) -17.5% |
| Circum. inches (mm) | 108.66 (2759.89) | 94.8 (2408.03) | -13.85 (-351.86) -12.7% |
| Sidewall Height inches (mm) | 7.29 (185.25) | 5.09 (129.25) | -2.2 (-56) -30.2% |
| Revolutions per mile (km) | 583.12 (362.33) | 668.32 (415.28) | 85.2 (52.94) 14.6% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.45 mph (28.08 km/h) |
| 25 mph (40.23 km/h) | 21.81 mph (35.1 km/h) |
| 30 mph (48.28 km/h) | 26.18 mph (42.13 km/h) |
| 35 mph (56.33 km/h) | 30.54 mph (49.15 km/h) |
| 40 mph (64.37 km/h) | 34.9 mph (56.17 km/h) |
| 45 mph (72.42 km/h) | 39.26 mph (63.19 km/h) |
| 50 mph (80.47 km/h) | 43.63 mph (70.21 km/h) |
| 55 mph (88.51 km/h) | 47.99 mph (77.23 km/h) |
| 60 mph (96.56 km/h) | 52.35 mph (84.25 km/h) |
| 65 mph (104.61 km/h) | 56.71 mph (91.27 km/h) |
| 70 mph (112.65 km/h) | 61.08 mph (98.29 km/h) |
| 75 mph (120.7 km/h) | 65.44 mph (105.31 km/h) |
| 80 mph (128.75 km/h) | 69.8 mph (112.33 km/h) |
| 85 mph (136.79 km/h) | 74.16 mph (119.35 km/h) |
| 90 mph (144.84 km/h) | 78.53 mph (126.38 km/h) |
| 95 mph (152.89 km/h) | 82.89 mph (133.4 km/h) |
| 100 mph (160.93 km/h) | 87.25 mph (140.42 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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