Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 345/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 33.22 (843.9) | 5.83 (148) 21.3% |
| Width inches (mm) | 12.8 (325) | 13.58 (345) | 0.79 (20) 6.2% |
| Circum. inches (mm) | 86.07 (2186.23) | 104.38 (2651.19) | 18.31 (464.96) 21.3% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 6.11 (155.25) | 2.91 (74) 91.1% |
| Revolutions per mile (km) | 736.13 (457.41) | 607.03 (377.19) | -129.1 (-80.22) -17.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.25 mph (39.03 km/h) |
| 25 mph (40.23 km/h) | 30.32 mph (48.79 km/h) |
| 30 mph (48.28 km/h) | 36.38 mph (58.55 km/h) |
| 35 mph (56.33 km/h) | 42.44 mph (68.31 km/h) |
| 40 mph (64.37 km/h) | 48.51 mph (78.06 km/h) |
| 45 mph (72.42 km/h) | 54.57 mph (87.82 km/h) |
| 50 mph (80.47 km/h) | 60.63 mph (97.58 km/h) |
| 55 mph (88.51 km/h) | 66.7 mph (107.34 km/h) |
| 60 mph (96.56 km/h) | 72.76 mph (117.1 km/h) |
| 65 mph (104.61 km/h) | 78.82 mph (126.85 km/h) |
| 70 mph (112.65 km/h) | 84.89 mph (136.61 km/h) |
| 75 mph (120.7 km/h) | 90.95 mph (146.37 km/h) |
| 80 mph (128.75 km/h) | 97.01 mph (156.13 km/h) |
| 85 mph (136.79 km/h) | 103.08 mph (165.89 km/h) |
| 90 mph (144.84 km/h) | 109.14 mph (175.65 km/h) |
| 95 mph (152.89 km/h) | 115.2 mph (185.4 km/h) |
| 100 mph (160.93 km/h) | 121.27 mph (195.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1545 | 1795 | 1933 | 2018 | 2110 | 2176 | 2248 | 2334 | 2452 | 2570 | 2702 | 2807 | 2998 | 3208 | 3372 | 3477 | 3537 | 3753 | 4056 | 4713 |
Better Fuel Economy Factory Ratios Increased Power
