Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-20 | 325/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.2 (691) | 27.68 (703) | 0.47 (12) 1.7% |
| Width inches (mm) | 12.01 (305) | 12.8 (325) | 0.79 (20) 6.6% |
| Circum. inches (mm) | 85.47 (2170.84) | 86.95 (2208.54) | 1.48 (37.7) 1.7% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 3.84 (97.5) | 0.24 (6) 6.6% |
| Revolutions per mile (km) | 741.35 (460.65) | 728.69 (452.79) | -12.65 (-7.86) -1.7% |
325/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.35 mph (32.75 km/h) |
| 25 mph (40.23 km/h) | 25.43 mph (40.93 km/h) |
| 30 mph (48.28 km/h) | 30.52 mph (49.12 km/h) |
| 35 mph (56.33 km/h) | 35.61 mph (57.31 km/h) |
| 40 mph (64.37 km/h) | 40.69 mph (65.49 km/h) |
| 45 mph (72.42 km/h) | 45.78 mph (73.68 km/h) |
| 50 mph (80.47 km/h) | 50.87 mph (81.86 km/h) |
| 55 mph (88.51 km/h) | 55.96 mph (90.05 km/h) |
| 60 mph (96.56 km/h) | 61.04 mph (98.24 km/h) |
| 65 mph (104.61 km/h) | 66.13 mph (106.42 km/h) |
| 70 mph (112.65 km/h) | 71.22 mph (114.61 km/h) |
| 75 mph (120.7 km/h) | 76.3 mph (122.8 km/h) |
| 80 mph (128.75 km/h) | 81.39 mph (130.98 km/h) |
| 85 mph (136.79 km/h) | 86.48 mph (139.17 km/h) |
| 90 mph (144.84 km/h) | 91.56 mph (147.36 km/h) |
| 95 mph (152.89 km/h) | 96.65 mph (155.54 km/h) |
| 100 mph (160.93 km/h) | 101.74 mph (163.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1854 | 2154 | 2320 | 2423 | 2533 | 2612 | 2699 | 2801 | 2943 | 3085 | 3243 | 3369 | 3598 | 3851 | 4048 | 4174 | 4245 | 4506 | 4869 | 5658 |
Better Fuel Economy Factory Ratios Increased Power
