Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-15 | 180/55-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.5 (597) | 22.8 (579) | -0.71 (-18) -3% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 73.84 (1875.53) | 71.61 (1818.98) | -2.23 (-56.55) -3% |
| Sidewall Height inches (mm) | 4.25 (108) | 3.9 (99) | -0.35 (-9) -8.3% |
| Revolutions per mile (km) | 858.07 (533.18) | 884.75 (549.76) | 26.68 (16.58) 3.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.4 mph (31.22 km/h) |
| 25 mph (40.23 km/h) | 24.25 mph (39.02 km/h) |
| 30 mph (48.28 km/h) | 29.1 mph (46.82 km/h) |
| 35 mph (56.33 km/h) | 33.94 mph (54.63 km/h) |
| 40 mph (64.37 km/h) | 38.79 mph (62.43 km/h) |
| 45 mph (72.42 km/h) | 43.64 mph (70.24 km/h) |
| 50 mph (80.47 km/h) | 48.49 mph (78.04 km/h) |
| 55 mph (88.51 km/h) | 53.34 mph (85.85 km/h) |
| 60 mph (96.56 km/h) | 58.19 mph (93.65 km/h) |
| 65 mph (104.61 km/h) | 63.04 mph (101.45 km/h) |
| 70 mph (112.65 km/h) | 67.89 mph (109.26 km/h) |
| 75 mph (120.7 km/h) | 72.74 mph (117.06 km/h) |
| 80 mph (128.75 km/h) | 77.59 mph (124.87 km/h) |
| 85 mph (136.79 km/h) | 82.44 mph (132.67 km/h) |
| 90 mph (144.84 km/h) | 87.29 mph (140.47 km/h) |
| 95 mph (152.89 km/h) | 92.14 mph (148.28 km/h) |
| 100 mph (160.93 km/h) | 96.98 mph (156.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2252 | 2616 | 2817 | 2941 | 3075 | 3171 | 3277 | 3401 | 3574 | 3746 | 3938 | 4091 | 4369 | 4675 | 4915 | 5068 | 5155 | 5471 | 5911 | 6870 |
Better Fuel Economy Factory Ratios Increased Power
