Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 345/40-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 34.87 (885.6) | 7.47 (189.7) 27.3% |
| Width inches (mm) | 12.8 (325) | 13.58 (345) | 0.79 (20) 6.2% |
| Circum. inches (mm) | 86.07 (2186.23) | 109.54 (2782.19) | 23.46 (595.96) 27.3% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 5.43 (138) | 2.23 (56.75) 69.8% |
| Revolutions per mile (km) | 736.13 (457.41) | 578.44 (359.43) | -157.68 (-97.98) -21.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.45 mph (40.96 km/h) |
| 25 mph (40.23 km/h) | 31.81 mph (51.2 km/h) |
| 30 mph (48.28 km/h) | 38.18 mph (61.44 km/h) |
| 35 mph (56.33 km/h) | 44.54 mph (71.68 km/h) |
| 40 mph (64.37 km/h) | 50.9 mph (81.92 km/h) |
| 45 mph (72.42 km/h) | 57.27 mph (92.16 km/h) |
| 50 mph (80.47 km/h) | 63.63 mph (102.4 km/h) |
| 55 mph (88.51 km/h) | 69.99 mph (112.64 km/h) |
| 60 mph (96.56 km/h) | 76.36 mph (122.88 km/h) |
| 65 mph (104.61 km/h) | 82.72 mph (133.12 km/h) |
| 70 mph (112.65 km/h) | 89.08 mph (143.36 km/h) |
| 75 mph (120.7 km/h) | 95.44 mph (153.6 km/h) |
| 80 mph (128.75 km/h) | 101.81 mph (163.84 km/h) |
| 85 mph (136.79 km/h) | 108.17 mph (174.08 km/h) |
| 90 mph (144.84 km/h) | 114.53 mph (184.32 km/h) |
| 95 mph (152.89 km/h) | 120.9 mph (194.56 km/h) |
| 100 mph (160.93 km/h) | 127.26 mph (204.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1472 | 1710 | 1842 | 1923 | 2011 | 2073 | 2142 | 2224 | 2336 | 2449 | 2574 | 2675 | 2856 | 3057 | 3213 | 3314 | 3370 | 3577 | 3865 | 4491 |
Better Fuel Economy Factory Ratios Increased Power
