Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-21 | 325/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.85 (732.9) | 29.96 (760.9) | 1.1 (28) 3.8% |
| Width inches (mm) | 11.22 (285) | 12.8 (325) | 1.57 (40) 14% |
| Circum. inches (mm) | 90.65 (2302.47) | 94.11 (2390.44) | 3.46 (87.96) 3.8% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 4.48 (113.75) | 0.55 (14) 14% |
| Revolutions per mile (km) | 698.96 (434.31) | 673.24 (418.33) | -25.72 (-15.98) -3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.76 mph (33.42 km/h) |
| 25 mph (40.23 km/h) | 25.96 mph (41.77 km/h) |
| 30 mph (48.28 km/h) | 31.15 mph (50.12 km/h) |
| 35 mph (56.33 km/h) | 36.34 mph (58.48 km/h) |
| 40 mph (64.37 km/h) | 41.53 mph (66.83 km/h) |
| 45 mph (72.42 km/h) | 46.72 mph (75.19 km/h) |
| 50 mph (80.47 km/h) | 51.91 mph (83.54 km/h) |
| 55 mph (88.51 km/h) | 57.1 mph (91.9 km/h) |
| 60 mph (96.56 km/h) | 62.29 mph (100.25 km/h) |
| 65 mph (104.61 km/h) | 67.48 mph (108.6 km/h) |
| 70 mph (112.65 km/h) | 72.67 mph (116.96 km/h) |
| 75 mph (120.7 km/h) | 77.87 mph (125.31 km/h) |
| 80 mph (128.75 km/h) | 83.06 mph (133.67 km/h) |
| 85 mph (136.79 km/h) | 88.25 mph (142.02 km/h) |
| 90 mph (144.84 km/h) | 93.44 mph (150.37 km/h) |
| 95 mph (152.89 km/h) | 98.63 mph (158.73 km/h) |
| 100 mph (160.93 km/h) | 103.82 mph (167.08 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
