Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 32.34 (821.5) | 1.54 (39) 5% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 96.78 (2458.3) | 101.61 (2580.82) | 4.82 (122.52) 5% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 6.17 (156.75) | 0.77 (19.5) 14.2% |
| Revolutions per mile (km) | 654.66 (406.79) | 623.58 (387.47) | -31.08 (-19.31) -4.7% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21 mph (33.79 km/h) |
| 25 mph (40.23 km/h) | 26.25 mph (42.24 km/h) |
| 30 mph (48.28 km/h) | 31.5 mph (50.69 km/h) |
| 35 mph (56.33 km/h) | 36.74 mph (59.13 km/h) |
| 40 mph (64.37 km/h) | 41.99 mph (67.58 km/h) |
| 45 mph (72.42 km/h) | 47.24 mph (76.03 km/h) |
| 50 mph (80.47 km/h) | 52.49 mph (84.48 km/h) |
| 55 mph (88.51 km/h) | 57.74 mph (92.93 km/h) |
| 60 mph (96.56 km/h) | 62.99 mph (101.37 km/h) |
| 65 mph (104.61 km/h) | 68.24 mph (109.82 km/h) |
| 70 mph (112.65 km/h) | 73.49 mph (118.27 km/h) |
| 75 mph (120.7 km/h) | 78.74 mph (126.72 km/h) |
| 80 mph (128.75 km/h) | 83.99 mph (135.16 km/h) |
| 85 mph (136.79 km/h) | 89.24 mph (143.61 km/h) |
| 90 mph (144.84 km/h) | 94.49 mph (152.06 km/h) |
| 95 mph (152.89 km/h) | 99.73 mph (160.51 km/h) |
| 100 mph (160.93 km/h) | 104.98 mph (168.96 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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