Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/12.5-18 | 325/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.03 (940.56) | 35.91 (912.2) | -1.12 (-28.36) -3% |
| Width inches (mm) | 12.52 (318) | 12.8 (325) | 0.28 (7) 2.2% |
| Circum. inches (mm) | 116.33 (2954.86) | 112.83 (2865.76) | -3.51 (-89.1) -3% |
| Sidewall Height inches (mm) | 9.51 (241.68) | 8.96 (227.5) | -0.56 (-14.18) -5.9% |
| Revolutions per mile (km) | 544.64 (338.43) | 561.58 (348.95) | 16.93 (10.52) 3.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.4 mph (31.22 km/h) |
| 25 mph (40.23 km/h) | 24.25 mph (39.02 km/h) |
| 30 mph (48.28 km/h) | 29.1 mph (46.82 km/h) |
| 35 mph (56.33 km/h) | 33.94 mph (54.63 km/h) |
| 40 mph (64.37 km/h) | 38.79 mph (62.43 km/h) |
| 45 mph (72.42 km/h) | 43.64 mph (70.24 km/h) |
| 50 mph (80.47 km/h) | 48.49 mph (78.04 km/h) |
| 55 mph (88.51 km/h) | 53.34 mph (85.85 km/h) |
| 60 mph (96.56 km/h) | 58.19 mph (93.65 km/h) |
| 65 mph (104.61 km/h) | 63.04 mph (101.45 km/h) |
| 70 mph (112.65 km/h) | 67.89 mph (109.26 km/h) |
| 75 mph (120.7 km/h) | 72.74 mph (117.06 km/h) |
| 80 mph (128.75 km/h) | 77.59 mph (124.87 km/h) |
| 85 mph (136.79 km/h) | 82.44 mph (132.67 km/h) |
| 90 mph (144.84 km/h) | 87.29 mph (140.47 km/h) |
| 95 mph (152.89 km/h) | 92.14 mph (148.28 km/h) |
| 100 mph (160.93 km/h) | 96.98 mph (156.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1429 | 1660 | 1788 | 1867 | 1952 | 2013 | 2080 | 2159 | 2268 | 2378 | 2499 | 2597 | 2773 | 2968 | 3120 | 3217 | 3272 | 3472 | 3752 | 4360 |
Better Fuel Economy Factory Ratios Increased Power
