Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/60-18 | 255/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.05 (763.2) | 31.04 (788.5) | 1 (25.3) 3.3% |
| Width inches (mm) | 10.04 (255) | 10.04 (255) | 0 (0) 0% |
| Circum. inches (mm) | 94.4 (2397.66) | 97.53 (2477.15) | 3.13 (79.48) 3.3% |
| Sidewall Height inches (mm) | 6.02 (153) | 5.52 (140.25) | -0.5 (-12.75) -8.3% |
| Revolutions per mile (km) | 671.21 (417.07) | 649.68 (403.69) | -21.54 (-13.38) -3.2% |
255/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.66 mph (33.25 km/h) |
| 25 mph (40.23 km/h) | 25.83 mph (41.57 km/h) |
| 30 mph (48.28 km/h) | 30.99 mph (49.88 km/h) |
| 35 mph (56.33 km/h) | 36.16 mph (58.19 km/h) |
| 40 mph (64.37 km/h) | 41.33 mph (66.51 km/h) |
| 45 mph (72.42 km/h) | 46.49 mph (74.82 km/h) |
| 50 mph (80.47 km/h) | 51.66 mph (83.13 km/h) |
| 55 mph (88.51 km/h) | 56.82 mph (91.45 km/h) |
| 60 mph (96.56 km/h) | 61.99 mph (99.76 km/h) |
| 65 mph (104.61 km/h) | 67.15 mph (108.08 km/h) |
| 70 mph (112.65 km/h) | 72.32 mph (116.39 km/h) |
| 75 mph (120.7 km/h) | 77.49 mph (124.7 km/h) |
| 80 mph (128.75 km/h) | 82.65 mph (133.02 km/h) |
| 85 mph (136.79 km/h) | 87.82 mph (141.33 km/h) |
| 90 mph (144.84 km/h) | 92.98 mph (149.64 km/h) |
| 95 mph (152.89 km/h) | 98.15 mph (157.96 km/h) |
| 100 mph (160.93 km/h) | 103.31 mph (166.27 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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