Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 170/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 28.71 (729.2) | 0.79 (20) 2.8% |
| Width inches (mm) | 7.09 (180) | 6.69 (170) | -0.39 (-10) -5.6% |
| Circum. inches (mm) | 87.72 (2228.02) | 90.19 (2290.85) | 2.47 (62.83) 2.8% |
| Sidewall Height inches (mm) | 4.96 (126) | 5.35 (136) | 0.39 (10) 7.9% |
| Revolutions per mile (km) | 722.32 (448.83) | 702.51 (436.52) | -19.81 (-12.31) -2.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.56 mph (33.09 km/h) |
| 25 mph (40.23 km/h) | 25.71 mph (41.37 km/h) |
| 30 mph (48.28 km/h) | 30.85 mph (49.64 km/h) |
| 35 mph (56.33 km/h) | 35.99 mph (57.92 km/h) |
| 40 mph (64.37 km/h) | 41.13 mph (66.19 km/h) |
| 45 mph (72.42 km/h) | 46.27 mph (74.46 km/h) |
| 50 mph (80.47 km/h) | 51.41 mph (82.74 km/h) |
| 55 mph (88.51 km/h) | 56.55 mph (91.01 km/h) |
| 60 mph (96.56 km/h) | 61.69 mph (99.28 km/h) |
| 65 mph (104.61 km/h) | 66.83 mph (107.56 km/h) |
| 70 mph (112.65 km/h) | 71.97 mph (115.83 km/h) |
| 75 mph (120.7 km/h) | 77.12 mph (124.1 km/h) |
| 80 mph (128.75 km/h) | 82.26 mph (132.38 km/h) |
| 85 mph (136.79 km/h) | 87.4 mph (140.65 km/h) |
| 90 mph (144.84 km/h) | 92.54 mph (148.93 km/h) |
| 95 mph (152.89 km/h) | 97.68 mph (157.2 km/h) |
| 100 mph (160.93 km/h) | 102.82 mph (165.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1788 | 2077 | 2237 | 2335 | 2442 | 2518 | 2602 | 2701 | 2838 | 2975 | 3127 | 3248 | 3469 | 3712 | 3903 | 4024 | 4093 | 4344 | 4694 | 5455 |
Better Fuel Economy Factory Ratios Increased Power
