Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 325/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 27.68 (703) | 0.28 (7.1) 1% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 86.07 (2186.23) | 86.95 (2208.54) | 0.88 (22.31) 1% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 3.84 (97.5) | 0.64 (16.25) 20% |
| Revolutions per mile (km) | 736.13 (457.41) | 728.69 (452.79) | -7.43 (-4.62) -1% |
325/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.2 mph (32.52 km/h) |
| 25 mph (40.23 km/h) | 25.26 mph (40.64 km/h) |
| 30 mph (48.28 km/h) | 30.31 mph (48.77 km/h) |
| 35 mph (56.33 km/h) | 35.36 mph (56.9 km/h) |
| 40 mph (64.37 km/h) | 40.41 mph (65.03 km/h) |
| 45 mph (72.42 km/h) | 45.46 mph (73.16 km/h) |
| 50 mph (80.47 km/h) | 50.51 mph (81.29 km/h) |
| 55 mph (88.51 km/h) | 55.56 mph (89.42 km/h) |
| 60 mph (96.56 km/h) | 60.61 mph (97.55 km/h) |
| 65 mph (104.61 km/h) | 65.66 mph (105.67 km/h) |
| 70 mph (112.65 km/h) | 70.71 mph (113.8 km/h) |
| 75 mph (120.7 km/h) | 75.77 mph (121.93 km/h) |
| 80 mph (128.75 km/h) | 80.82 mph (130.06 km/h) |
| 85 mph (136.79 km/h) | 85.87 mph (138.19 km/h) |
| 90 mph (144.84 km/h) | 90.92 mph (146.32 km/h) |
| 95 mph (152.89 km/h) | 95.97 mph (154.45 km/h) |
| 100 mph (160.93 km/h) | 101.02 mph (162.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1854 | 2154 | 2320 | 2423 | 2533 | 2612 | 2699 | 2801 | 2943 | 3085 | 3243 | 3369 | 3598 | 3851 | 4048 | 4174 | 4245 | 4506 | 4869 | 5658 |
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