Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 425/35-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 26.71 (678.5) | -0.69 (-17.4) -2.5% |
| Width inches (mm) | 12.8 (325) | 16.73 (425) | 3.94 (100) 30.8% |
| Circum. inches (mm) | 86.07 (2186.23) | 83.92 (2131.57) | -2.15 (-54.66) -2.5% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 5.86 (148.75) | 2.66 (67.5) 83.1% |
| Revolutions per mile (km) | 736.13 (457.41) | 755 (469.14) | 18.88 (11.73) 2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.5 mph (31.38 km/h) |
| 25 mph (40.23 km/h) | 24.37 mph (39.23 km/h) |
| 30 mph (48.28 km/h) | 29.25 mph (47.07 km/h) |
| 35 mph (56.33 km/h) | 34.12 mph (54.92 km/h) |
| 40 mph (64.37 km/h) | 39 mph (62.76 km/h) |
| 45 mph (72.42 km/h) | 43.87 mph (70.61 km/h) |
| 50 mph (80.47 km/h) | 48.75 mph (78.46 km/h) |
| 55 mph (88.51 km/h) | 53.62 mph (86.3 km/h) |
| 60 mph (96.56 km/h) | 58.5 mph (94.15 km/h) |
| 65 mph (104.61 km/h) | 63.37 mph (101.99 km/h) |
| 70 mph (112.65 km/h) | 68.25 mph (109.84 km/h) |
| 75 mph (120.7 km/h) | 73.12 mph (117.68 km/h) |
| 80 mph (128.75 km/h) | 78 mph (125.53 km/h) |
| 85 mph (136.79 km/h) | 82.87 mph (133.37 km/h) |
| 90 mph (144.84 km/h) | 87.75 mph (141.22 km/h) |
| 95 mph (152.89 km/h) | 92.62 mph (149.07 km/h) |
| 100 mph (160.93 km/h) | 97.5 mph (156.91 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1921 | 2232 | 2404 | 2510 | 2624 | 2706 | 2796 | 2902 | 3050 | 3197 | 3360 | 3491 | 3728 | 3990 | 4194 | 4325 | 4399 | 4668 | 5045 | 5862 |
Better Fuel Economy Factory Ratios Increased Power
