Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 330/30-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 29.8 (756.8) | 1.12 (28.4) 3.9% |
| Width inches (mm) | 12.8 (325) | 12.99 (330) | 0.2 (5) 1.5% |
| Circum. inches (mm) | 90.09 (2288.34) | 93.6 (2377.56) | 3.51 (89.22) 3.9% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.9 (99) | 0.06 (1.5) 1.5% |
| Revolutions per mile (km) | 703.28 (437) | 676.89 (420.6) | -26.39 (-16.4) -3.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.78 mph (33.44 km/h) |
| 25 mph (40.23 km/h) | 25.97 mph (41.8 km/h) |
| 30 mph (48.28 km/h) | 31.17 mph (50.16 km/h) |
| 35 mph (56.33 km/h) | 36.36 mph (58.52 km/h) |
| 40 mph (64.37 km/h) | 41.56 mph (66.88 km/h) |
| 45 mph (72.42 km/h) | 46.75 mph (75.24 km/h) |
| 50 mph (80.47 km/h) | 51.95 mph (83.6 km/h) |
| 55 mph (88.51 km/h) | 57.14 mph (91.97 km/h) |
| 60 mph (96.56 km/h) | 62.34 mph (100.33 km/h) |
| 65 mph (104.61 km/h) | 67.53 mph (108.69 km/h) |
| 70 mph (112.65 km/h) | 72.73 mph (117.05 km/h) |
| 75 mph (120.7 km/h) | 77.92 mph (125.41 km/h) |
| 80 mph (128.75 km/h) | 83.12 mph (133.77 km/h) |
| 85 mph (136.79 km/h) | 88.31 mph (142.13 km/h) |
| 90 mph (144.84 km/h) | 93.51 mph (150.49 km/h) |
| 95 mph (152.89 km/h) | 98.7 mph (158.85 km/h) |
| 100 mph (160.93 km/h) | 103.9 mph (167.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1723 | 2001 | 2155 | 2250 | 2353 | 2426 | 2507 | 2602 | 2734 | 2866 | 3013 | 3130 | 3342 | 3577 | 3760 | 3878 | 3944 | 4185 | 4523 | 5256 |
Better Fuel Economy Factory Ratios Increased Power
