Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/12.5-18 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.03 (940.56) | 33.16 (842.2) | -3.87 (-98.36) -10.5% |
| Width inches (mm) | 12.52 (318) | 10.83 (275) | -1.69 (-43) -13.5% |
| Circum. inches (mm) | 116.33 (2954.86) | 104.17 (2645.85) | -12.17 (-309.01) -10.5% |
| Sidewall Height inches (mm) | 9.51 (241.68) | 7.58 (192.5) | -1.94 (-49.18) -20.3% |
| Revolutions per mile (km) | 544.64 (338.43) | 608.25 (377.95) | 63.61 (39.52) 11.7% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.91 mph (28.82 km/h) |
| 25 mph (40.23 km/h) | 22.39 mph (36.03 km/h) |
| 30 mph (48.28 km/h) | 26.86 mph (43.23 km/h) |
| 35 mph (56.33 km/h) | 31.34 mph (50.44 km/h) |
| 40 mph (64.37 km/h) | 35.82 mph (57.64 km/h) |
| 45 mph (72.42 km/h) | 40.29 mph (64.85 km/h) |
| 50 mph (80.47 km/h) | 44.77 mph (72.05 km/h) |
| 55 mph (88.51 km/h) | 49.25 mph (79.26 km/h) |
| 60 mph (96.56 km/h) | 53.73 mph (86.46 km/h) |
| 65 mph (104.61 km/h) | 58.2 mph (93.67 km/h) |
| 70 mph (112.65 km/h) | 62.68 mph (100.87 km/h) |
| 75 mph (120.7 km/h) | 67.16 mph (108.08 km/h) |
| 80 mph (128.75 km/h) | 71.63 mph (115.28 km/h) |
| 85 mph (136.79 km/h) | 76.11 mph (122.49 km/h) |
| 90 mph (144.84 km/h) | 80.59 mph (129.69 km/h) |
| 95 mph (152.89 km/h) | 85.07 mph (136.9 km/h) |
| 100 mph (160.93 km/h) | 89.54 mph (144.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1548 | 1798 | 1937 | 2022 | 2114 | 2180 | 2253 | 2338 | 2457 | 2575 | 2707 | 2813 | 3004 | 3214 | 3379 | 3484 | 3544 | 3761 | 4064 | 4723 |
Better Fuel Economy Factory Ratios Increased Power
