Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 345/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 39.02 (991) | 3.54 (90) 10% |
| Width inches (mm) | 12.8 (325) | 13.58 (345) | 0.79 (20) 6.2% |
| Circum. inches (mm) | 111.44 (2830.57) | 122.57 (3113.32) | 11.13 (282.74) 10% |
| Sidewall Height inches (mm) | 10.24 (260) | 9.51 (241.5) | -0.73 (-18.5) -7.1% |
| Revolutions per mile (km) | 568.56 (353.28) | 516.92 (321.2) | -51.63 (-32.08) -9.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22 mph (35.4 km/h) |
| 25 mph (40.23 km/h) | 27.5 mph (44.25 km/h) |
| 30 mph (48.28 km/h) | 33 mph (53.1 km/h) |
| 35 mph (56.33 km/h) | 38.5 mph (61.95 km/h) |
| 40 mph (64.37 km/h) | 44 mph (70.8 km/h) |
| 45 mph (72.42 km/h) | 49.5 mph (79.65 km/h) |
| 50 mph (80.47 km/h) | 54.99 mph (88.51 km/h) |
| 55 mph (88.51 km/h) | 60.49 mph (97.36 km/h) |
| 60 mph (96.56 km/h) | 65.99 mph (106.21 km/h) |
| 65 mph (104.61 km/h) | 71.49 mph (115.06 km/h) |
| 70 mph (112.65 km/h) | 76.99 mph (123.91 km/h) |
| 75 mph (120.7 km/h) | 82.49 mph (132.76 km/h) |
| 80 mph (128.75 km/h) | 87.99 mph (141.61 km/h) |
| 85 mph (136.79 km/h) | 93.49 mph (150.46 km/h) |
| 90 mph (144.84 km/h) | 98.99 mph (159.31 km/h) |
| 95 mph (152.89 km/h) | 104.49 mph (168.16 km/h) |
| 100 mph (160.93 km/h) | 109.99 mph (177.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1315 | 1528 | 1646 | 1719 | 1797 | 1853 | 1914 | 1987 | 2088 | 2189 | 2301 | 2390 | 2553 | 2732 | 2872 | 2961 | 3012 | 3196 | 3454 | 4014 |
Better Fuel Economy Factory Ratios Increased Power
