Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 37/12-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 37.09 (942.2) | 1.62 (41.2) 4.6% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 111.44 (2830.57) | 116.54 (2960.01) | 5.1 (129.43) 4.6% |
| Sidewall Height inches (mm) | 10.24 (260) | 11.05 (280.6) | 0.81 (20.6) 7.9% |
| Revolutions per mile (km) | 568.56 (353.28) | 543.7 (337.84) | -24.86 (-15.45) -4.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.91 mph (33.66 km/h) |
| 25 mph (40.23 km/h) | 26.14 mph (42.07 km/h) |
| 30 mph (48.28 km/h) | 31.37 mph (50.49 km/h) |
| 35 mph (56.33 km/h) | 36.6 mph (58.9 km/h) |
| 40 mph (64.37 km/h) | 41.83 mph (67.32 km/h) |
| 45 mph (72.42 km/h) | 47.06 mph (75.73 km/h) |
| 50 mph (80.47 km/h) | 52.29 mph (84.15 km/h) |
| 55 mph (88.51 km/h) | 57.51 mph (92.56 km/h) |
| 60 mph (96.56 km/h) | 62.74 mph (100.98 km/h) |
| 65 mph (104.61 km/h) | 67.97 mph (109.39 km/h) |
| 70 mph (112.65 km/h) | 73.2 mph (117.81 km/h) |
| 75 mph (120.7 km/h) | 78.43 mph (126.22 km/h) |
| 80 mph (128.75 km/h) | 83.66 mph (134.64 km/h) |
| 85 mph (136.79 km/h) | 88.89 mph (143.05 km/h) |
| 90 mph (144.84 km/h) | 94.12 mph (151.46 km/h) |
| 95 mph (152.89 km/h) | 99.34 mph (159.88 km/h) |
| 100 mph (160.93 km/h) | 104.57 mph (168.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1384 | 1607 | 1731 | 1808 | 1890 | 1949 | 2014 | 2090 | 2196 | 2302 | 2420 | 2514 | 2685 | 2873 | 3020 | 3115 | 3168 | 3362 | 3633 | 4221 |
Better Fuel Economy Factory Ratios Increased Power
