Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 325/30-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 26.68 (677.6) | -1.56 (-39.6) -5.5% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 88.71 (2253.15) | 83.81 (2128.74) | -4.9 (-124.41) -5.5% |
| Sidewall Height inches (mm) | 5.12 (130) | 3.84 (97.5) | -1.28 (-32.5) -25% |
| Revolutions per mile (km) | 714.26 (443.82) | 756.01 (469.76) | 41.74 (25.94) 5.8% |
325/30-19 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.9 mph (30.41 km/h) |
| 25 mph (40.23 km/h) | 23.62 mph (38.01 km/h) |
| 30 mph (48.28 km/h) | 28.34 mph (45.61 km/h) |
| 35 mph (56.33 km/h) | 33.07 mph (53.22 km/h) |
| 40 mph (64.37 km/h) | 37.79 mph (60.82 km/h) |
| 45 mph (72.42 km/h) | 42.52 mph (68.42 km/h) |
| 50 mph (80.47 km/h) | 47.24 mph (76.02 km/h) |
| 55 mph (88.51 km/h) | 51.96 mph (83.63 km/h) |
| 60 mph (96.56 km/h) | 56.69 mph (91.23 km/h) |
| 65 mph (104.61 km/h) | 61.41 mph (98.83 km/h) |
| 70 mph (112.65 km/h) | 66.13 mph (106.43 km/h) |
| 75 mph (120.7 km/h) | 70.86 mph (114.04 km/h) |
| 80 mph (128.75 km/h) | 75.58 mph (121.64 km/h) |
| 85 mph (136.79 km/h) | 80.31 mph (129.24 km/h) |
| 90 mph (144.84 km/h) | 85.03 mph (136.84 km/h) |
| 95 mph (152.89 km/h) | 89.75 mph (144.45 km/h) |
| 100 mph (160.93 km/h) | 94.48 mph (152.05 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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