Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 270/75-18 | 255/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.94 (862.2) | 32.06 (814.2) | -1.89 (-48) -5.6% |
| Width inches (mm) | 10.63 (270) | 10.04 (255) | -0.59 (-15) -5.6% |
| Circum. inches (mm) | 106.64 (2708.68) | 100.7 (2557.88) | -5.94 (-150.8) -5.6% |
| Sidewall Height inches (mm) | 7.97 (202.5) | 7.03 (178.5) | -0.94 (-24) -11.9% |
| Revolutions per mile (km) | 594.14 (369.18) | 629.17 (390.95) | 35.03 (21.76) 5.9% |
255/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.89 mph (30.4 km/h) |
| 25 mph (40.23 km/h) | 23.61 mph (37.99 km/h) |
| 30 mph (48.28 km/h) | 28.33 mph (45.59 km/h) |
| 35 mph (56.33 km/h) | 33.05 mph (53.19 km/h) |
| 40 mph (64.37 km/h) | 37.77 mph (60.79 km/h) |
| 45 mph (72.42 km/h) | 42.49 mph (68.39 km/h) |
| 50 mph (80.47 km/h) | 47.22 mph (75.99 km/h) |
| 55 mph (88.51 km/h) | 51.94 mph (83.59 km/h) |
| 60 mph (96.56 km/h) | 56.66 mph (91.19 km/h) |
| 65 mph (104.61 km/h) | 61.38 mph (98.78 km/h) |
| 70 mph (112.65 km/h) | 66.1 mph (106.38 km/h) |
| 75 mph (120.7 km/h) | 70.82 mph (113.98 km/h) |
| 80 mph (128.75 km/h) | 75.55 mph (121.58 km/h) |
| 85 mph (136.79 km/h) | 80.27 mph (129.18 km/h) |
| 90 mph (144.84 km/h) | 84.99 mph (136.78 km/h) |
| 95 mph (152.89 km/h) | 89.71 mph (144.38 km/h) |
| 100 mph (160.93 km/h) | 94.43 mph (151.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1601 | 1860 | 2003 | 2092 | 2187 | 2255 | 2330 | 2419 | 2541 | 2664 | 2800 | 2909 | 3107 | 3325 | 3495 | 3604 | 3666 | 3890 | 4204 | 4885 |
Better Fuel Economy Factory Ratios Increased Power
