Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/50-20 | 285/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.01 (813) | 31.22 (793) | -0.79 (-20) -2.5% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 100.56 (2554.11) | 98.08 (2491.28) | -2.47 (-62.83) -2.5% |
| Sidewall Height inches (mm) | 6 (152.5) | 5.61 (142.5) | -0.39 (-10) -6.6% |
| Revolutions per mile (km) | 630.1 (391.52) | 645.99 (401.4) | 15.89 (9.87) 2.5% |
285/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.51 mph (31.4 km/h) |
| 25 mph (40.23 km/h) | 24.38 mph (39.24 km/h) |
| 30 mph (48.28 km/h) | 29.26 mph (47.09 km/h) |
| 35 mph (56.33 km/h) | 34.14 mph (54.94 km/h) |
| 40 mph (64.37 km/h) | 39.02 mph (62.79 km/h) |
| 45 mph (72.42 km/h) | 43.89 mph (70.64 km/h) |
| 50 mph (80.47 km/h) | 48.77 mph (78.49 km/h) |
| 55 mph (88.51 km/h) | 53.65 mph (86.34 km/h) |
| 60 mph (96.56 km/h) | 58.52 mph (94.19 km/h) |
| 65 mph (104.61 km/h) | 63.4 mph (102.03 km/h) |
| 70 mph (112.65 km/h) | 68.28 mph (109.88 km/h) |
| 75 mph (120.7 km/h) | 73.15 mph (117.73 km/h) |
| 80 mph (128.75 km/h) | 78.03 mph (125.58 km/h) |
| 85 mph (136.79 km/h) | 82.91 mph (133.43 km/h) |
| 90 mph (144.84 km/h) | 87.79 mph (141.28 km/h) |
| 95 mph (152.89 km/h) | 92.66 mph (149.13 km/h) |
| 100 mph (160.93 km/h) | 97.54 mph (156.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1644 | 1910 | 2057 | 2148 | 2246 | 2315 | 2392 | 2483 | 2609 | 2735 | 2875 | 2987 | 3190 | 3414 | 3589 | 3701 | 3764 | 3994 | 4316 | 5016 |
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