Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 325/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 28.96 (735.5) | 0.28 (7.1) 1% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 90.09 (2288.34) | 90.97 (2310.64) | 0.88 (22.31) 1% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 4.48 (113.75) | 0.64 (16.25) 16.7% |
| Revolutions per mile (km) | 703.28 (437) | 696.49 (432.78) | -6.79 (-4.22) -1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.19 mph (32.5 km/h) |
| 25 mph (40.23 km/h) | 25.24 mph (40.63 km/h) |
| 30 mph (48.28 km/h) | 30.29 mph (48.75 km/h) |
| 35 mph (56.33 km/h) | 35.34 mph (56.88 km/h) |
| 40 mph (64.37 km/h) | 40.39 mph (65 km/h) |
| 45 mph (72.42 km/h) | 45.44 mph (73.13 km/h) |
| 50 mph (80.47 km/h) | 50.49 mph (81.25 km/h) |
| 55 mph (88.51 km/h) | 55.54 mph (89.38 km/h) |
| 60 mph (96.56 km/h) | 60.58 mph (97.5 km/h) |
| 65 mph (104.61 km/h) | 65.63 mph (105.63 km/h) |
| 70 mph (112.65 km/h) | 70.68 mph (113.75 km/h) |
| 75 mph (120.7 km/h) | 75.73 mph (121.88 km/h) |
| 80 mph (128.75 km/h) | 80.78 mph (130 km/h) |
| 85 mph (136.79 km/h) | 85.83 mph (138.13 km/h) |
| 90 mph (144.84 km/h) | 90.88 mph (146.25 km/h) |
| 95 mph (152.89 km/h) | 95.93 mph (154.38 km/h) |
| 100 mph (160.93 km/h) | 100.97 mph (162.5 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1772 | 2059 | 2217 | 2315 | 2421 | 2497 | 2579 | 2678 | 2813 | 2949 | 3100 | 3221 | 3439 | 3681 | 3869 | 3990 | 4058 | 4307 | 4654 | 5408 |
Better Fuel Economy Factory Ratios Increased Power
