Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/55-18 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.04 (737.7) | 32.34 (821.5) | 3.3 (83.8) 11.4% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 91.24 (2317.55) | 101.61 (2580.82) | 10.36 (263.27) 11.4% |
| Sidewall Height inches (mm) | 5.52 (140.25) | 6.17 (156.75) | 0.65 (16.5) 11.8% |
| Revolutions per mile (km) | 694.42 (431.49) | 623.58 (387.47) | -70.84 (-44.02) -10.2% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.27 mph (35.84 km/h) |
| 25 mph (40.23 km/h) | 27.84 mph (44.8 km/h) |
| 30 mph (48.28 km/h) | 33.41 mph (53.76 km/h) |
| 35 mph (56.33 km/h) | 38.98 mph (62.73 km/h) |
| 40 mph (64.37 km/h) | 44.54 mph (71.69 km/h) |
| 45 mph (72.42 km/h) | 50.11 mph (80.65 km/h) |
| 50 mph (80.47 km/h) | 55.68 mph (89.61 km/h) |
| 55 mph (88.51 km/h) | 61.25 mph (98.57 km/h) |
| 60 mph (96.56 km/h) | 66.82 mph (107.53 km/h) |
| 65 mph (104.61 km/h) | 72.38 mph (116.49 km/h) |
| 70 mph (112.65 km/h) | 77.95 mph (125.45 km/h) |
| 75 mph (120.7 km/h) | 83.52 mph (134.41 km/h) |
| 80 mph (128.75 km/h) | 89.09 mph (143.37 km/h) |
| 85 mph (136.79 km/h) | 94.66 mph (152.33 km/h) |
| 90 mph (144.84 km/h) | 100.22 mph (161.29 km/h) |
| 95 mph (152.89 km/h) | 105.79 mph (170.26 km/h) |
| 100 mph (160.93 km/h) | 111.36 mph (179.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1587 | 1843 | 1985 | 2073 | 2168 | 2235 | 2309 | 2397 | 2519 | 2640 | 2775 | 2883 | 3079 | 3295 | 3464 | 3572 | 3633 | 3856 | 4166 | 4842 |
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