Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-15 | 180/80-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.5 (597) | 26.34 (669) | 2.83 (72) 12.1% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 73.84 (1875.53) | 82.75 (2101.73) | 8.91 (226.19) 12.1% |
| Sidewall Height inches (mm) | 4.25 (108) | 5.67 (144) | 1.42 (36) 33.3% |
| Revolutions per mile (km) | 858.07 (533.18) | 765.73 (475.8) | -92.35 (-57.38) -10.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.41 mph (36.07 km/h) |
| 25 mph (40.23 km/h) | 28.02 mph (45.09 km/h) |
| 30 mph (48.28 km/h) | 33.62 mph (54.1 km/h) |
| 35 mph (56.33 km/h) | 39.22 mph (63.12 km/h) |
| 40 mph (64.37 km/h) | 44.82 mph (72.14 km/h) |
| 45 mph (72.42 km/h) | 50.43 mph (81.15 km/h) |
| 50 mph (80.47 km/h) | 56.03 mph (90.17 km/h) |
| 55 mph (88.51 km/h) | 61.63 mph (99.19 km/h) |
| 60 mph (96.56 km/h) | 67.24 mph (108.21 km/h) |
| 65 mph (104.61 km/h) | 72.84 mph (117.22 km/h) |
| 70 mph (112.65 km/h) | 78.44 mph (126.24 km/h) |
| 75 mph (120.7 km/h) | 84.05 mph (135.26 km/h) |
| 80 mph (128.75 km/h) | 89.65 mph (144.28 km/h) |
| 85 mph (136.79 km/h) | 95.25 mph (153.29 km/h) |
| 90 mph (144.84 km/h) | 100.85 mph (162.31 km/h) |
| 95 mph (152.89 km/h) | 106.46 mph (171.33 km/h) |
| 100 mph (160.93 km/h) | 112.06 mph (180.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1949 | 2264 | 2438 | 2546 | 2662 | 2745 | 2836 | 2944 | 3093 | 3242 | 3408 | 3541 | 3781 | 4047 | 4254 | 4386 | 4461 | 4735 | 5116 | 5945 |
Better Fuel Economy Factory Ratios Increased Power
