Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.68 (703) | 27.2 (691) | -0.47 (-12) -1.7% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 86.95 (2208.54) | 85.47 (2170.84) | -1.48 (-37.7) -1.7% |
| 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) | 741.35 (460.65) | 12.65 (7.86) 1.7% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.66 mph (31.64 km/h) |
| 25 mph (40.23 km/h) | 24.57 mph (39.55 km/h) |
| 30 mph (48.28 km/h) | 29.49 mph (47.46 km/h) |
| 35 mph (56.33 km/h) | 34.4 mph (55.37 km/h) |
| 40 mph (64.37 km/h) | 39.32 mph (63.28 km/h) |
| 45 mph (72.42 km/h) | 44.23 mph (71.18 km/h) |
| 50 mph (80.47 km/h) | 49.15 mph (79.09 km/h) |
| 55 mph (88.51 km/h) | 54.06 mph (87 km/h) |
| 60 mph (96.56 km/h) | 58.98 mph (94.91 km/h) |
| 65 mph (104.61 km/h) | 63.89 mph (102.82 km/h) |
| 70 mph (112.65 km/h) | 68.81 mph (110.73 km/h) |
| 75 mph (120.7 km/h) | 73.72 mph (118.64 km/h) |
| 80 mph (128.75 km/h) | 78.63 mph (126.55 km/h) |
| 85 mph (136.79 km/h) | 83.55 mph (134.46 km/h) |
| 90 mph (144.84 km/h) | 88.46 mph (142.37 km/h) |
| 95 mph (152.89 km/h) | 93.38 mph (150.28 km/h) |
| 100 mph (160.93 km/h) | 98.29 mph (158.19 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 |
Better Fuel Economy Factory Ratios Increased Power
