Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-19 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.1 (739.1) | 32.01 (813) | 2.91 (73.9) 10% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 91.42 (2321.95) | 100.56 (2554.11) | 9.14 (232.16) 10% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 6 (152.5) | 0.95 (24.25) 18.9% |
| Revolutions per mile (km) | 693.1 (430.67) | 630.1 (391.52) | -63 (-39.15) -9.1% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22 mph (35.41 km/h) |
| 25 mph (40.23 km/h) | 27.5 mph (44.26 km/h) |
| 30 mph (48.28 km/h) | 33 mph (53.11 km/h) |
| 35 mph (56.33 km/h) | 38.5 mph (61.96 km/h) |
| 40 mph (64.37 km/h) | 44 mph (70.81 km/h) |
| 45 mph (72.42 km/h) | 49.5 mph (79.66 km/h) |
| 50 mph (80.47 km/h) | 55 mph (88.51 km/h) |
| 55 mph (88.51 km/h) | 60.5 mph (97.36 km/h) |
| 60 mph (96.56 km/h) | 66 mph (106.22 km/h) |
| 65 mph (104.61 km/h) | 71.5 mph (115.07 km/h) |
| 70 mph (112.65 km/h) | 77 mph (123.92 km/h) |
| 75 mph (120.7 km/h) | 82.5 mph (132.77 km/h) |
| 80 mph (128.75 km/h) | 88 mph (141.62 km/h) |
| 85 mph (136.79 km/h) | 93.5 mph (150.47 km/h) |
| 90 mph (144.84 km/h) | 99 mph (159.32 km/h) |
| 95 mph (152.89 km/h) | 104.5 mph (168.17 km/h) |
| 100 mph (160.93 km/h) | 110 mph (177.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1603 | 1863 | 2006 | 2095 | 2190 | 2259 | 2334 | 2422 | 2545 | 2668 | 2804 | 2914 | 3111 | 3330 | 3500 | 3610 | 3671 | 3896 | 4210 | 4892 |
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