Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-21 | 325/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.68 (753.9) | 29.96 (760.9) | 0.28 (7) 0.9% |
| Width inches (mm) | 12.4 (315) | 12.8 (325) | 0.39 (10) 3.2% |
| Circum. inches (mm) | 93.25 (2368.45) | 94.11 (2390.44) | 0.87 (21.99) 0.9% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 4.48 (113.75) | 0.14 (3.5) 3.2% |
| Revolutions per mile (km) | 679.49 (422.22) | 673.24 (418.33) | -6.25 (-3.88) -0.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.19 mph (32.49 km/h) |
| 25 mph (40.23 km/h) | 25.23 mph (40.61 km/h) |
| 30 mph (48.28 km/h) | 30.28 mph (48.73 km/h) |
| 35 mph (56.33 km/h) | 35.32 mph (56.85 km/h) |
| 40 mph (64.37 km/h) | 40.37 mph (64.97 km/h) |
| 45 mph (72.42 km/h) | 45.42 mph (73.09 km/h) |
| 50 mph (80.47 km/h) | 50.46 mph (81.21 km/h) |
| 55 mph (88.51 km/h) | 55.51 mph (89.34 km/h) |
| 60 mph (96.56 km/h) | 60.56 mph (97.46 km/h) |
| 65 mph (104.61 km/h) | 65.6 mph (105.58 km/h) |
| 70 mph (112.65 km/h) | 70.65 mph (113.7 km/h) |
| 75 mph (120.7 km/h) | 75.7 mph (121.82 km/h) |
| 80 mph (128.75 km/h) | 80.74 mph (129.94 km/h) |
| 85 mph (136.79 km/h) | 85.79 mph (138.06 km/h) |
| 90 mph (144.84 km/h) | 90.84 mph (146.19 km/h) |
| 95 mph (152.89 km/h) | 95.88 mph (154.31 km/h) |
| 100 mph (160.93 km/h) | 100.93 mph (162.43 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
