Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 325/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 34.91 (886.8) | -0.56 (-14.2) -1.6% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 111.44 (2830.57) | 109.68 (2785.96) | -1.76 (-44.61) -1.6% |
| Sidewall Height inches (mm) | 10.24 (260) | 8.96 (227.5) | -1.28 (-32.5) -12.5% |
| Revolutions per mile (km) | 568.56 (353.28) | 577.66 (358.94) | 9.1 (5.66) 1.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.68 mph (31.68 km/h) |
| 25 mph (40.23 km/h) | 24.61 mph (39.6 km/h) |
| 30 mph (48.28 km/h) | 29.53 mph (47.52 km/h) |
| 35 mph (56.33 km/h) | 34.45 mph (55.44 km/h) |
| 40 mph (64.37 km/h) | 39.37 mph (63.36 km/h) |
| 45 mph (72.42 km/h) | 44.29 mph (71.28 km/h) |
| 50 mph (80.47 km/h) | 49.21 mph (79.2 km/h) |
| 55 mph (88.51 km/h) | 54.13 mph (87.12 km/h) |
| 60 mph (96.56 km/h) | 59.05 mph (95.04 km/h) |
| 65 mph (104.61 km/h) | 63.98 mph (102.96 km/h) |
| 70 mph (112.65 km/h) | 68.9 mph (110.88 km/h) |
| 75 mph (120.7 km/h) | 73.82 mph (118.8 km/h) |
| 80 mph (128.75 km/h) | 78.74 mph (126.72 km/h) |
| 85 mph (136.79 km/h) | 83.66 mph (134.64 km/h) |
| 90 mph (144.84 km/h) | 88.58 mph (142.56 km/h) |
| 95 mph (152.89 km/h) | 93.5 mph (150.48 km/h) |
| 100 mph (160.93 km/h) | 98.42 mph (158.4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1470 | 1708 | 1839 | 1920 | 2008 | 2071 | 2139 | 2221 | 2333 | 2446 | 2571 | 2671 | 2852 | 3053 | 3209 | 3309 | 3365 | 3572 | 3860 | 4485 |
Better Fuel Economy Factory Ratios Increased Power
