Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-19 | 305/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.1 (739.1) | 30.81 (782.5) | 1.71 (43.4) 5.9% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 91.42 (2321.95) | 96.78 (2458.3) | 5.37 (136.35) 5.9% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 5.4 (137.25) | 0.35 (9) 7% |
| Revolutions per mile (km) | 693.1 (430.67) | 654.66 (406.79) | -38.44 (-23.89) -5.5% |
305/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.17 mph (34.08 km/h) |
| 25 mph (40.23 km/h) | 26.47 mph (42.6 km/h) |
| 30 mph (48.28 km/h) | 31.76 mph (51.12 km/h) |
| 35 mph (56.33 km/h) | 37.06 mph (59.63 km/h) |
| 40 mph (64.37 km/h) | 42.35 mph (68.15 km/h) |
| 45 mph (72.42 km/h) | 47.64 mph (76.67 km/h) |
| 50 mph (80.47 km/h) | 52.94 mph (85.19 km/h) |
| 55 mph (88.51 km/h) | 58.23 mph (93.71 km/h) |
| 60 mph (96.56 km/h) | 63.52 mph (102.23 km/h) |
| 65 mph (104.61 km/h) | 68.82 mph (110.75 km/h) |
| 70 mph (112.65 km/h) | 74.11 mph (119.27 km/h) |
| 75 mph (120.7 km/h) | 79.4 mph (127.79 km/h) |
| 80 mph (128.75 km/h) | 84.7 mph (136.31 km/h) |
| 85 mph (136.79 km/h) | 89.99 mph (144.83 km/h) |
| 90 mph (144.84 km/h) | 95.28 mph (153.35 km/h) |
| 95 mph (152.89 km/h) | 100.58 mph (161.87 km/h) |
| 100 mph (160.93 km/h) | 105.87 mph (170.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1666 | 1935 | 2084 | 2176 | 2276 | 2347 | 2425 | 2517 | 2644 | 2772 | 2914 | 3027 | 3233 | 3460 | 3637 | 3750 | 3814 | 4048 | 4374 | 5083 |
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