Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.73 (679) | 27.2 (691) | 0.47 (12) 1.8% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 83.98 (2133.14) | 85.47 (2170.84) | 1.48 (37.7) 1.8% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.6 (91.5) | 0.24 (6) 7% |
| Revolutions per mile (km) | 754.45 (468.79) | 741.35 (460.65) | -13.1 (-8.14) -1.7% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.35 mph (32.76 km/h) |
| 25 mph (40.23 km/h) | 25.44 mph (40.94 km/h) |
| 30 mph (48.28 km/h) | 30.53 mph (49.13 km/h) |
| 35 mph (56.33 km/h) | 35.62 mph (57.32 km/h) |
| 40 mph (64.37 km/h) | 40.71 mph (65.51 km/h) |
| 45 mph (72.42 km/h) | 45.8 mph (73.7 km/h) |
| 50 mph (80.47 km/h) | 50.88 mph (81.89 km/h) |
| 55 mph (88.51 km/h) | 55.97 mph (90.08 km/h) |
| 60 mph (96.56 km/h) | 61.06 mph (98.27 km/h) |
| 65 mph (104.61 km/h) | 66.15 mph (106.46 km/h) |
| 70 mph (112.65 km/h) | 71.24 mph (114.65 km/h) |
| 75 mph (120.7 km/h) | 76.33 mph (122.83 km/h) |
| 80 mph (128.75 km/h) | 81.41 mph (131.02 km/h) |
| 85 mph (136.79 km/h) | 86.5 mph (139.21 km/h) |
| 90 mph (144.84 km/h) | 91.59 mph (147.4 km/h) |
| 95 mph (152.89 km/h) | 96.68 mph (155.59 km/h) |
| 100 mph (160.93 km/h) | 101.77 mph (163.78 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1887 | 2192 | 2360 | 2465 | 2577 | 2657 | 2746 | 2850 | 2994 | 3139 | 3300 | 3428 | 3661 | 3918 | 4118 | 4247 | 4319 | 4584 | 4953 | 5756 |
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