Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-20 | 325/30-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.68 (703) | 26.68 (677.6) | -1 (-25.4) -3.6% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 86.95 (2208.54) | 83.81 (2128.74) | -3.14 (-79.8) -3.6% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.84 (97.5) | 0 (0) 0% |
| Revolutions per mile (km) | 728.69 (452.79) | 756.01 (469.76) | 27.32 (16.97) 3.7% |
325/30-19 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.28 mph (31.02 km/h) |
| 25 mph (40.23 km/h) | 24.1 mph (38.78 km/h) |
| 30 mph (48.28 km/h) | 28.92 mph (46.54 km/h) |
| 35 mph (56.33 km/h) | 33.74 mph (54.29 km/h) |
| 40 mph (64.37 km/h) | 38.55 mph (62.05 km/h) |
| 45 mph (72.42 km/h) | 43.37 mph (69.8 km/h) |
| 50 mph (80.47 km/h) | 48.19 mph (77.56 km/h) |
| 55 mph (88.51 km/h) | 53.01 mph (85.32 km/h) |
| 60 mph (96.56 km/h) | 57.83 mph (93.07 km/h) |
| 65 mph (104.61 km/h) | 62.65 mph (100.83 km/h) |
| 70 mph (112.65 km/h) | 67.47 mph (108.58 km/h) |
| 75 mph (120.7 km/h) | 72.29 mph (116.34 km/h) |
| 80 mph (128.75 km/h) | 77.11 mph (124.1 km/h) |
| 85 mph (136.79 km/h) | 81.93 mph (131.85 km/h) |
| 90 mph (144.84 km/h) | 86.75 mph (139.61 km/h) |
| 95 mph (152.89 km/h) | 91.57 mph (147.36 km/h) |
| 100 mph (160.93 km/h) | 96.39 mph (155.12 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2235 | 2407 | 2513 | 2628 | 2710 | 2800 | 2906 | 3054 | 3201 | 3365 | 3496 | 3733 | 3995 | 4200 | 4331 | 4404 | 4675 | 5051 | 5870 |
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