Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/35-21 | 325/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.58 (725.9) | 28.68 (728.4) | 0.1 (2.5) 0.3% |
| Width inches (mm) | 10.83 (275) | 12.8 (325) | 1.97 (50) 18.2% |
| Circum. inches (mm) | 89.78 (2280.48) | 90.09 (2288.34) | 0.31 (7.85) 0.3% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 3.84 (97.5) | 0.05 (1.25) 1.3% |
| Revolutions per mile (km) | 705.7 (438.5) | 703.28 (437) | -2.42 (-1.51) -0.3% |
325/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.07 mph (32.3 km/h) |
| 25 mph (40.23 km/h) | 25.09 mph (40.37 km/h) |
| 30 mph (48.28 km/h) | 30.1 mph (48.45 km/h) |
| 35 mph (56.33 km/h) | 35.12 mph (56.52 km/h) |
| 40 mph (64.37 km/h) | 40.14 mph (64.6 km/h) |
| 45 mph (72.42 km/h) | 45.15 mph (72.67 km/h) |
| 50 mph (80.47 km/h) | 50.17 mph (80.74 km/h) |
| 55 mph (88.51 km/h) | 55.19 mph (88.82 km/h) |
| 60 mph (96.56 km/h) | 60.21 mph (96.89 km/h) |
| 65 mph (104.61 km/h) | 65.22 mph (104.97 km/h) |
| 70 mph (112.65 km/h) | 70.24 mph (113.04 km/h) |
| 75 mph (120.7 km/h) | 75.26 mph (121.12 km/h) |
| 80 mph (128.75 km/h) | 80.28 mph (129.19 km/h) |
| 85 mph (136.79 km/h) | 85.29 mph (137.27 km/h) |
| 90 mph (144.84 km/h) | 90.31 mph (145.34 km/h) |
| 95 mph (152.89 km/h) | 95.33 mph (153.41 km/h) |
| 100 mph (160.93 km/h) | 100.34 mph (161.49 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1790 | 2079 | 2239 | 2338 | 2445 | 2521 | 2605 | 2704 | 2841 | 2978 | 3130 | 3252 | 3473 | 3717 | 3907 | 4029 | 4097 | 4349 | 4699 | 5461 |
Better Fuel Economy Factory Ratios Increased Power
