Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 325/88-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 40.52 (1029.2) | 5.05 (128.2) 14.2% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 111.44 (2830.57) | 127.3 (3233.33) | 15.86 (402.75) 14.2% |
| Sidewall Height inches (mm) | 10.24 (260) | 11.26 (286) | 1.02 (26) 10% |
| Revolutions per mile (km) | 568.56 (353.28) | 497.74 (309.28) | -70.82 (-44.01) -12.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.85 mph (36.77 km/h) |
| 25 mph (40.23 km/h) | 28.56 mph (45.96 km/h) |
| 30 mph (48.28 km/h) | 34.27 mph (55.15 km/h) |
| 35 mph (56.33 km/h) | 39.98 mph (64.34 km/h) |
| 40 mph (64.37 km/h) | 45.69 mph (73.53 km/h) |
| 45 mph (72.42 km/h) | 51.4 mph (82.73 km/h) |
| 50 mph (80.47 km/h) | 57.11 mph (91.92 km/h) |
| 55 mph (88.51 km/h) | 62.83 mph (101.11 km/h) |
| 60 mph (96.56 km/h) | 68.54 mph (110.3 km/h) |
| 65 mph (104.61 km/h) | 74.25 mph (119.49 km/h) |
| 70 mph (112.65 km/h) | 79.96 mph (128.68 km/h) |
| 75 mph (120.7 km/h) | 85.67 mph (137.88 km/h) |
| 80 mph (128.75 km/h) | 91.38 mph (147.07 km/h) |
| 85 mph (136.79 km/h) | 97.09 mph (156.26 km/h) |
| 90 mph (144.84 km/h) | 102.81 mph (165.45 km/h) |
| 95 mph (152.89 km/h) | 108.52 mph (174.64 km/h) |
| 100 mph (160.93 km/h) | 114.23 mph (183.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1267 | 1471 | 1585 | 1655 | 1730 | 1784 | 1843 | 1913 | 2010 | 2107 | 2215 | 2302 | 2458 | 2630 | 2765 | 2851 | 2900 | 3078 | 3326 | 3865 |
Better Fuel Economy Factory Ratios Increased Power
