Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-20 | 255/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.18 (766.5) | 31.04 (788.5) | 0.87 (22) 2.9% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 94.8 (2408.03) | 97.53 (2477.15) | 2.72 (69.12) 2.9% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 5.52 (140.25) | 0.43 (11) 8.5% |
| Revolutions per mile (km) | 668.32 (415.28) | 649.68 (403.69) | -18.65 (-11.59) -2.8% |
255/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.57 mph (33.11 km/h) |
| 25 mph (40.23 km/h) | 25.72 mph (41.39 km/h) |
| 30 mph (48.28 km/h) | 30.86 mph (49.67 km/h) |
| 35 mph (56.33 km/h) | 36 mph (57.94 km/h) |
| 40 mph (64.37 km/h) | 41.15 mph (66.22 km/h) |
| 45 mph (72.42 km/h) | 46.29 mph (74.5 km/h) |
| 50 mph (80.47 km/h) | 51.44 mph (82.78 km/h) |
| 55 mph (88.51 km/h) | 56.58 mph (91.05 km/h) |
| 60 mph (96.56 km/h) | 61.72 mph (99.33 km/h) |
| 65 mph (104.61 km/h) | 66.87 mph (107.61 km/h) |
| 70 mph (112.65 km/h) | 72.01 mph (115.89 km/h) |
| 75 mph (120.7 km/h) | 77.15 mph (124.17 km/h) |
| 80 mph (128.75 km/h) | 82.3 mph (132.44 km/h) |
| 85 mph (136.79 km/h) | 87.44 mph (140.72 km/h) |
| 90 mph (144.84 km/h) | 92.58 mph (149 km/h) |
| 95 mph (152.89 km/h) | 97.73 mph (157.28 km/h) |
| 100 mph (160.93 km/h) | 102.87 mph (165.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1653 | 1921 | 2068 | 2160 | 2258 | 2329 | 2406 | 2498 | 2624 | 2751 | 2892 | 3004 | 3208 | 3433 | 3609 | 3722 | 3785 | 4017 | 4341 | 5044 |
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