Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 325/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 29.96 (760.9) | 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) | 94.11 (2390.44) | 4.02 (102.1) 4.5% |
| 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) | 673.24 (418.33) | -30.04 (-18.67) -4.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.89 mph (33.62 km/h) |
| 25 mph (40.23 km/h) | 26.12 mph (42.03 km/h) |
| 30 mph (48.28 km/h) | 31.34 mph (50.43 km/h) |
| 35 mph (56.33 km/h) | 36.56 mph (58.84 km/h) |
| 40 mph (64.37 km/h) | 41.78 mph (67.25 km/h) |
| 45 mph (72.42 km/h) | 47.01 mph (75.65 km/h) |
| 50 mph (80.47 km/h) | 52.23 mph (84.06 km/h) |
| 55 mph (88.51 km/h) | 57.45 mph (92.46 km/h) |
| 60 mph (96.56 km/h) | 62.68 mph (100.87 km/h) |
| 65 mph (104.61 km/h) | 67.9 mph (109.27 km/h) |
| 70 mph (112.65 km/h) | 73.12 mph (117.68 km/h) |
| 75 mph (120.7 km/h) | 78.35 mph (126.09 km/h) |
| 80 mph (128.75 km/h) | 83.57 mph (134.49 km/h) |
| 85 mph (136.79 km/h) | 88.79 mph (142.9 km/h) |
| 90 mph (144.84 km/h) | 94.02 mph (151.3 km/h) |
| 95 mph (152.89 km/h) | 99.24 mph (159.71 km/h) |
| 100 mph (160.93 km/h) | 104.46 mph (168.12 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1713 | 1990 | 2143 | 2238 | 2340 | 2413 | 2493 | 2588 | 2719 | 2851 | 2996 | 3113 | 3324 | 3558 | 3740 | 3857 | 3922 | 4163 | 4498 | 5227 |
Better Fuel Economy Factory Ratios Increased Power
