Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 325/25-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 26.4 (670.5) | -1.75 (-44.5) -6.2% |
| Width inches (mm) | 13.58 (345) | 12.8 (325) | -0.79 (-20) -5.8% |
| Circum. inches (mm) | 88.43 (2246.24) | 82.93 (2106.44) | -5.5 (-139.8) -6.2% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 3.2 (81.25) | -0.88 (-22.25) -21.5% |
| Revolutions per mile (km) | 716.46 (445.19) | 764.01 (474.73) | 47.55 (29.55) 6.6% |
325/25-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.76 mph (30.18 km/h) |
| 25 mph (40.23 km/h) | 23.44 mph (37.73 km/h) |
| 30 mph (48.28 km/h) | 28.13 mph (45.28 km/h) |
| 35 mph (56.33 km/h) | 32.82 mph (52.82 km/h) |
| 40 mph (64.37 km/h) | 37.51 mph (60.37 km/h) |
| 45 mph (72.42 km/h) | 42.2 mph (67.91 km/h) |
| 50 mph (80.47 km/h) | 46.89 mph (75.46 km/h) |
| 55 mph (88.51 km/h) | 51.58 mph (83.01 km/h) |
| 60 mph (96.56 km/h) | 56.27 mph (90.55 km/h) |
| 65 mph (104.61 km/h) | 60.95 mph (98.1 km/h) |
| 70 mph (112.65 km/h) | 65.64 mph (105.64 km/h) |
| 75 mph (120.7 km/h) | 70.33 mph (113.19 km/h) |
| 80 mph (128.75 km/h) | 75.02 mph (120.73 km/h) |
| 85 mph (136.79 km/h) | 79.71 mph (128.28 km/h) |
| 90 mph (144.84 km/h) | 84.4 mph (135.83 km/h) |
| 95 mph (152.89 km/h) | 89.09 mph (143.37 km/h) |
| 100 mph (160.93 km/h) | 93.78 mph (150.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1944 | 2259 | 2432 | 2540 | 2656 | 2739 | 2830 | 2937 | 3086 | 3235 | 3400 | 3533 | 3773 | 4037 | 4244 | 4377 | 4451 | 4724 | 5105 | 5932 |
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