Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 325/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 27.4 (695.9) | -1.28 (-32.5) -4.5% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 90.09 (2288.34) | 86.07 (2186.23) | -4.02 (-102.1) -4.5% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.2 (81.25) | -0.64 (-16.25) -16.7% |
| Revolutions per mile (km) | 703.28 (437) | 736.13 (457.41) | 32.84 (20.41) 4.7% |
325/25-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.11 mph (30.75 km/h) |
| 25 mph (40.23 km/h) | 23.88 mph (38.44 km/h) |
| 30 mph (48.28 km/h) | 28.66 mph (46.13 km/h) |
| 35 mph (56.33 km/h) | 33.44 mph (53.81 km/h) |
| 40 mph (64.37 km/h) | 38.22 mph (61.5 km/h) |
| 45 mph (72.42 km/h) | 42.99 mph (69.19 km/h) |
| 50 mph (80.47 km/h) | 47.77 mph (76.88 km/h) |
| 55 mph (88.51 km/h) | 52.55 mph (84.56 km/h) |
| 60 mph (96.56 km/h) | 57.32 mph (92.25 km/h) |
| 65 mph (104.61 km/h) | 62.1 mph (99.94 km/h) |
| 70 mph (112.65 km/h) | 66.88 mph (107.63 km/h) |
| 75 mph (120.7 km/h) | 71.65 mph (115.32 km/h) |
| 80 mph (128.75 km/h) | 76.43 mph (123 km/h) |
| 85 mph (136.79 km/h) | 81.21 mph (130.69 km/h) |
| 90 mph (144.84 km/h) | 85.98 mph (138.38 km/h) |
| 95 mph (152.89 km/h) | 90.76 mph (146.07 km/h) |
| 100 mph (160.93 km/h) | 95.54 mph (153.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1873 | 2176 | 2344 | 2447 | 2559 | 2639 | 2726 | 2830 | 2973 | 3117 | 3276 | 3404 | 3635 | 3890 | 4089 | 4217 | 4289 | 4552 | 4918 | 5716 |
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