Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-19 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.44 (671.6) | 27.2 (691) | 0.76 (19.4) 2.9% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 83.07 (2109.89) | 85.47 (2170.84) | 2.4 (60.95) 2.9% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 3.6 (91.5) | -0.12 (-3) -3.2% |
| Revolutions per mile (km) | 762.76 (473.96) | 741.35 (460.65) | -21.41 (-13.31) -2.8% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.58 mph (33.12 km/h) |
| 25 mph (40.23 km/h) | 25.72 mph (41.4 km/h) |
| 30 mph (48.28 km/h) | 30.87 mph (49.68 km/h) |
| 35 mph (56.33 km/h) | 36.01 mph (57.95 km/h) |
| 40 mph (64.37 km/h) | 41.16 mph (66.23 km/h) |
| 45 mph (72.42 km/h) | 46.3 mph (74.51 km/h) |
| 50 mph (80.47 km/h) | 51.44 mph (82.79 km/h) |
| 55 mph (88.51 km/h) | 56.59 mph (91.07 km/h) |
| 60 mph (96.56 km/h) | 61.73 mph (99.35 km/h) |
| 65 mph (104.61 km/h) | 66.88 mph (107.63 km/h) |
| 70 mph (112.65 km/h) | 72.02 mph (115.91 km/h) |
| 75 mph (120.7 km/h) | 77.17 mph (124.19 km/h) |
| 80 mph (128.75 km/h) | 82.31 mph (132.47 km/h) |
| 85 mph (136.79 km/h) | 87.46 mph (140.75 km/h) |
| 90 mph (144.84 km/h) | 92.6 mph (149.03 km/h) |
| 95 mph (152.89 km/h) | 97.74 mph (157.3 km/h) |
| 100 mph (160.93 km/h) | 102.89 mph (165.58 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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