Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/12.5-18 | 37/13.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.03 (940.56) | 36.91 (937.4) | -0.12 (-3.16) -0.3% |
| Width inches (mm) | 12.52 (318) | 13.5 (343) | 0.98 (25) 7.9% |
| Circum. inches (mm) | 116.33 (2954.86) | 115.94 (2944.93) | -0.39 (-9.93) -0.3% |
| Sidewall Height inches (mm) | 9.51 (241.68) | 9.45 (240.1) | -0.06 (-1.58) -0.7% |
| Revolutions per mile (km) | 544.64 (338.43) | 546.48 (339.57) | 1.84 (1.14) 0.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.93 mph (32.08 km/h) |
| 25 mph (40.23 km/h) | 24.92 mph (40.1 km/h) |
| 30 mph (48.28 km/h) | 29.9 mph (48.12 km/h) |
| 35 mph (56.33 km/h) | 34.88 mph (56.14 km/h) |
| 40 mph (64.37 km/h) | 39.87 mph (64.16 km/h) |
| 45 mph (72.42 km/h) | 44.85 mph (72.18 km/h) |
| 50 mph (80.47 km/h) | 49.83 mph (80.2 km/h) |
| 55 mph (88.51 km/h) | 54.82 mph (88.22 km/h) |
| 60 mph (96.56 km/h) | 59.8 mph (96.24 km/h) |
| 65 mph (104.61 km/h) | 64.78 mph (104.26 km/h) |
| 70 mph (112.65 km/h) | 69.76 mph (112.28 km/h) |
| 75 mph (120.7 km/h) | 74.75 mph (120.3 km/h) |
| 80 mph (128.75 km/h) | 79.73 mph (128.32 km/h) |
| 85 mph (136.79 km/h) | 84.71 mph (136.33 km/h) |
| 90 mph (144.84 km/h) | 89.7 mph (144.35 km/h) |
| 95 mph (152.89 km/h) | 94.68 mph (152.37 km/h) |
| 100 mph (160.93 km/h) | 99.66 mph (160.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1391 | 1616 | 1740 | 1817 | 1900 | 1959 | 2024 | 2101 | 2207 | 2314 | 2432 | 2527 | 2699 | 2888 | 3036 | 3131 | 3184 | 3379 | 3651 | 4243 |
Better Fuel Economy Factory Ratios Increased Power
