Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-17 | 120/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.8 (629.8) | 23.61 (599.8) | -1.18 (-30) -4.8% |
| Width inches (mm) | 7.09 (180) | 4.72 (120) | -2.36 (-60) -33.3% |
| Circum. inches (mm) | 77.9 (1978.58) | 74.19 (1884.33) | -3.71 (-94.25) -4.8% |
| Sidewall Height inches (mm) | 3.9 (99) | 3.31 (84) | -0.59 (-15) -15.2% |
| Revolutions per mile (km) | 813.39 (505.41) | 854.07 (530.69) | 40.68 (25.28) 5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.05 mph (30.65 km/h) |
| 25 mph (40.23 km/h) | 23.81 mph (38.32 km/h) |
| 30 mph (48.28 km/h) | 28.57 mph (45.98 km/h) |
| 35 mph (56.33 km/h) | 33.33 mph (53.64 km/h) |
| 40 mph (64.37 km/h) | 38.09 mph (61.31 km/h) |
| 45 mph (72.42 km/h) | 42.86 mph (68.97 km/h) |
| 50 mph (80.47 km/h) | 47.62 mph (76.63 km/h) |
| 55 mph (88.51 km/h) | 52.38 mph (84.3 km/h) |
| 60 mph (96.56 km/h) | 57.14 mph (91.96 km/h) |
| 65 mph (104.61 km/h) | 61.9 mph (99.62 km/h) |
| 70 mph (112.65 km/h) | 66.67 mph (107.29 km/h) |
| 75 mph (120.7 km/h) | 71.43 mph (114.95 km/h) |
| 80 mph (128.75 km/h) | 76.19 mph (122.61 km/h) |
| 85 mph (136.79 km/h) | 80.95 mph (130.28 km/h) |
| 90 mph (144.84 km/h) | 85.71 mph (137.94 km/h) |
| 95 mph (152.89 km/h) | 90.47 mph (145.61 km/h) |
| 100 mph (160.93 km/h) | 95.24 mph (153.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2173 | 2525 | 2719 | 2839 | 2969 | 3061 | 3163 | 3283 | 3450 | 3616 | 3801 | 3949 | 4217 | 4513 | 4745 | 4893 | 4976 | 5281 | 5706 | 6631 |
Better Fuel Economy Factory Ratios Increased Power
