Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.22 (793) | 32.01 (813) | 0.79 (20) 2.5% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 98.08 (2491.28) | 100.56 (2554.11) | 2.47 (62.83) 2.5% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 6 (152.5) | 0.39 (10) 7% |
| Revolutions per mile (km) | 645.99 (401.4) | 630.1 (391.52) | -15.89 (-9.87) -2.5% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.5 mph (33 km/h) |
| 25 mph (40.23 km/h) | 25.63 mph (41.25 km/h) |
| 30 mph (48.28 km/h) | 30.76 mph (49.5 km/h) |
| 35 mph (56.33 km/h) | 35.88 mph (57.75 km/h) |
| 40 mph (64.37 km/h) | 41.01 mph (66 km/h) |
| 45 mph (72.42 km/h) | 46.13 mph (74.25 km/h) |
| 50 mph (80.47 km/h) | 51.26 mph (82.5 km/h) |
| 55 mph (88.51 km/h) | 56.39 mph (90.75 km/h) |
| 60 mph (96.56 km/h) | 61.51 mph (99 km/h) |
| 65 mph (104.61 km/h) | 66.64 mph (107.25 km/h) |
| 70 mph (112.65 km/h) | 71.77 mph (115.5 km/h) |
| 75 mph (120.7 km/h) | 76.89 mph (123.75 km/h) |
| 80 mph (128.75 km/h) | 82.02 mph (131.99 km/h) |
| 85 mph (136.79 km/h) | 87.14 mph (140.24 km/h) |
| 90 mph (144.84 km/h) | 92.27 mph (148.49 km/h) |
| 95 mph (152.89 km/h) | 97.4 mph (156.74 km/h) |
| 100 mph (160.93 km/h) | 102.52 mph (164.99 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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