Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 355/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 35.37 (898.5) | 4.57 (116) 14.8% |
| Width inches (mm) | 12.01 (305) | 13.98 (355) | 1.97 (50) 16.4% |
| Circum. inches (mm) | 96.78 (2458.3) | 111.13 (2822.72) | 14.35 (364.42) 14.8% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 7.69 (195.25) | 2.28 (58) 42.3% |
| Revolutions per mile (km) | 654.66 (406.79) | 570.14 (354.27) | -84.52 (-52.52) -12.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.96 mph (36.96 km/h) |
| 25 mph (40.23 km/h) | 28.71 mph (46.2 km/h) |
| 30 mph (48.28 km/h) | 34.45 mph (55.44 km/h) |
| 35 mph (56.33 km/h) | 40.19 mph (64.68 km/h) |
| 40 mph (64.37 km/h) | 45.93 mph (73.92 km/h) |
| 45 mph (72.42 km/h) | 51.67 mph (83.16 km/h) |
| 50 mph (80.47 km/h) | 57.41 mph (92.4 km/h) |
| 55 mph (88.51 km/h) | 63.15 mph (101.64 km/h) |
| 60 mph (96.56 km/h) | 68.89 mph (110.88 km/h) |
| 65 mph (104.61 km/h) | 74.64 mph (120.11 km/h) |
| 70 mph (112.65 km/h) | 80.38 mph (129.35 km/h) |
| 75 mph (120.7 km/h) | 86.12 mph (138.59 km/h) |
| 80 mph (128.75 km/h) | 91.86 mph (147.83 km/h) |
| 85 mph (136.79 km/h) | 97.6 mph (157.07 km/h) |
| 90 mph (144.84 km/h) | 103.34 mph (166.31 km/h) |
| 95 mph (152.89 km/h) | 109.08 mph (175.55 km/h) |
| 100 mph (160.93 km/h) | 114.82 mph (184.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1451 | 1686 | 1815 | 1895 | 1982 | 2044 | 2112 | 2192 | 2303 | 2414 | 2538 | 2636 | 2815 | 3013 | 3167 | 3266 | 3322 | 3525 | 3809 | 4427 |
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