Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-20 | 325/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.85 (707.5) | 27.68 (703) | -0.18 (-4.5) -0.6% |
| Width inches (mm) | 11.22 (285) | 12.8 (325) | 1.57 (40) 14% |
| Circum. inches (mm) | 87.51 (2222.68) | 86.95 (2208.54) | -0.56 (-14.14) -0.6% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 3.84 (97.5) | -0.09 (-2.25) -2.3% |
| Revolutions per mile (km) | 724.06 (449.91) | 728.69 (452.79) | 4.63 (2.88) 0.6% |
325/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.87 mph (31.98 km/h) |
| 25 mph (40.23 km/h) | 24.84 mph (39.98 km/h) |
| 30 mph (48.28 km/h) | 29.81 mph (47.97 km/h) |
| 35 mph (56.33 km/h) | 34.78 mph (55.97 km/h) |
| 40 mph (64.37 km/h) | 39.75 mph (63.96 km/h) |
| 45 mph (72.42 km/h) | 44.71 mph (71.96 km/h) |
| 50 mph (80.47 km/h) | 49.68 mph (79.96 km/h) |
| 55 mph (88.51 km/h) | 54.65 mph (87.95 km/h) |
| 60 mph (96.56 km/h) | 59.62 mph (95.95 km/h) |
| 65 mph (104.61 km/h) | 64.59 mph (103.94 km/h) |
| 70 mph (112.65 km/h) | 69.55 mph (111.94 km/h) |
| 75 mph (120.7 km/h) | 74.52 mph (119.93 km/h) |
| 80 mph (128.75 km/h) | 79.49 mph (127.93 km/h) |
| 85 mph (136.79 km/h) | 84.46 mph (135.92 km/h) |
| 90 mph (144.84 km/h) | 89.43 mph (143.92 km/h) |
| 95 mph (152.89 km/h) | 94.4 mph (151.92 km/h) |
| 100 mph (160.93 km/h) | 99.36 mph (159.91 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
