Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-20 | 305/30-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.68 (703) | 26.2 (665.6) | -1.47 (-37.4) -5.3% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 86.95 (2208.54) | 82.32 (2091.04) | -4.63 (-117.5) -5.3% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.6 (91.5) | -0.24 (-6) -6.2% |
| Revolutions per mile (km) | 728.69 (452.79) | 769.64 (478.23) | 40.95 (25.44) 5.6% |
305/30-19 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.94 mph (30.47 km/h) |
| 25 mph (40.23 km/h) | 23.67 mph (38.09 km/h) |
| 30 mph (48.28 km/h) | 28.4 mph (45.71 km/h) |
| 35 mph (56.33 km/h) | 33.14 mph (53.33 km/h) |
| 40 mph (64.37 km/h) | 37.87 mph (60.95 km/h) |
| 45 mph (72.42 km/h) | 42.61 mph (68.57 km/h) |
| 50 mph (80.47 km/h) | 47.34 mph (76.19 km/h) |
| 55 mph (88.51 km/h) | 52.07 mph (83.81 km/h) |
| 60 mph (96.56 km/h) | 56.81 mph (91.42 km/h) |
| 65 mph (104.61 km/h) | 61.54 mph (99.04 km/h) |
| 70 mph (112.65 km/h) | 66.28 mph (106.66 km/h) |
| 75 mph (120.7 km/h) | 71.01 mph (114.28 km/h) |
| 80 mph (128.75 km/h) | 75.74 mph (121.9 km/h) |
| 85 mph (136.79 km/h) | 80.48 mph (129.52 km/h) |
| 90 mph (144.84 km/h) | 85.21 mph (137.14 km/h) |
| 95 mph (152.89 km/h) | 89.95 mph (144.75 km/h) |
| 100 mph (160.93 km/h) | 94.68 mph (152.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1959 | 2275 | 2450 | 2559 | 2675 | 2759 | 2850 | 2959 | 3109 | 3259 | 3425 | 3559 | 3800 | 4067 | 4276 | 4409 | 4484 | 4759 | 5142 | 5976 |
Better Fuel Economy Factory Ratios Increased Power
