Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 36/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 36.03 (915.12) | 0.11 (2.92) 0.3% |
| Width inches (mm) | 12.8 (325) | 12.52 (318) | -0.28 (-7) -2.2% |
| Circum. inches (mm) | 112.83 (2865.76) | 113.19 (2874.93) | 0.36 (9.17) 0.3% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 9.01 (228.96) | 0.06 (1.46) 0.6% |
| Revolutions per mile (km) | 561.58 (348.95) | 559.78 (347.83) | -1.79 (-1.11) -0.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.06 mph (32.29 km/h) |
| 25 mph (40.23 km/h) | 25.08 mph (40.36 km/h) |
| 30 mph (48.28 km/h) | 30.1 mph (48.43 km/h) |
| 35 mph (56.33 km/h) | 35.11 mph (56.51 km/h) |
| 40 mph (64.37 km/h) | 40.13 mph (64.58 km/h) |
| 45 mph (72.42 km/h) | 45.14 mph (72.65 km/h) |
| 50 mph (80.47 km/h) | 50.16 mph (80.72 km/h) |
| 55 mph (88.51 km/h) | 55.18 mph (88.8 km/h) |
| 60 mph (96.56 km/h) | 60.19 mph (96.87 km/h) |
| 65 mph (104.61 km/h) | 65.21 mph (104.94 km/h) |
| 70 mph (112.65 km/h) | 70.22 mph (113.01 km/h) |
| 75 mph (120.7 km/h) | 75.24 mph (121.09 km/h) |
| 80 mph (128.75 km/h) | 80.26 mph (129.16 km/h) |
| 85 mph (136.79 km/h) | 85.27 mph (137.23 km/h) |
| 90 mph (144.84 km/h) | 90.29 mph (145.3 km/h) |
| 95 mph (152.89 km/h) | 95.3 mph (153.38 km/h) |
| 100 mph (160.93 km/h) | 100.32 mph (161.45 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1425 | 1655 | 1782 | 1861 | 1946 | 2006 | 2073 | 2152 | 2261 | 2370 | 2491 | 2588 | 2764 | 2958 | 3110 | 3207 | 3261 | 3461 | 3740 | 4346 |
Better Fuel Economy Factory Ratios Increased Power
