Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/12.5-18 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.03 (940.56) | 34.81 (884.2) | -2.22 (-56.36) -6% |
| Width inches (mm) | 12.52 (318) | 12.01 (305) | -0.51 (-13) -4.1% |
| Circum. inches (mm) | 116.33 (2954.86) | 109.36 (2777.8) | -6.97 (-177.06) -6% |
| Sidewall Height inches (mm) | 9.51 (241.68) | 8.41 (213.5) | -1.11 (-28.18) -11.7% |
| Revolutions per mile (km) | 544.64 (338.43) | 579.36 (360) | 34.72 (21.57) 6.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.8 mph (30.26 km/h) |
| 25 mph (40.23 km/h) | 23.5 mph (37.82 km/h) |
| 30 mph (48.28 km/h) | 28.2 mph (45.39 km/h) |
| 35 mph (56.33 km/h) | 32.9 mph (52.95 km/h) |
| 40 mph (64.37 km/h) | 37.6 mph (60.52 km/h) |
| 45 mph (72.42 km/h) | 42.3 mph (68.08 km/h) |
| 50 mph (80.47 km/h) | 47 mph (75.65 km/h) |
| 55 mph (88.51 km/h) | 51.7 mph (83.21 km/h) |
| 60 mph (96.56 km/h) | 56.4 mph (90.77 km/h) |
| 65 mph (104.61 km/h) | 61.11 mph (98.34 km/h) |
| 70 mph (112.65 km/h) | 65.81 mph (105.9 km/h) |
| 75 mph (120.7 km/h) | 70.51 mph (113.47 km/h) |
| 80 mph (128.75 km/h) | 75.21 mph (121.03 km/h) |
| 85 mph (136.79 km/h) | 79.91 mph (128.6 km/h) |
| 90 mph (144.84 km/h) | 84.61 mph (136.16 km/h) |
| 95 mph (152.89 km/h) | 89.31 mph (143.73 km/h) |
| 100 mph (160.93 km/h) | 94.01 mph (151.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1713 | 1845 | 1926 | 2014 | 2077 | 2146 | 2227 | 2340 | 2453 | 2579 | 2679 | 2861 | 3062 | 3218 | 3319 | 3375 | 3582 | 3871 | 4498 |
Better Fuel Economy Factory Ratios Increased Power
