Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-15 | 180/40-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.5 (597) | 20.67 (525) | -2.83 (-72) -12.1% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 73.84 (1875.53) | 64.93 (1649.34) | -8.91 (-226.19) -12.1% |
| Sidewall Height inches (mm) | 4.25 (108) | 2.83 (72) | -1.42 (-36) -33.3% |
| Revolutions per mile (km) | 858.07 (533.18) | 975.75 (606.3) | 117.68 (73.12) 13.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.59 mph (28.31 km/h) |
| 25 mph (40.23 km/h) | 21.98 mph (35.38 km/h) |
| 30 mph (48.28 km/h) | 26.38 mph (42.46 km/h) |
| 35 mph (56.33 km/h) | 30.78 mph (49.53 km/h) |
| 40 mph (64.37 km/h) | 35.18 mph (56.61 km/h) |
| 45 mph (72.42 km/h) | 39.57 mph (63.69 km/h) |
| 50 mph (80.47 km/h) | 43.97 mph (70.76 km/h) |
| 55 mph (88.51 km/h) | 48.37 mph (77.84 km/h) |
| 60 mph (96.56 km/h) | 52.76 mph (84.92 km/h) |
| 65 mph (104.61 km/h) | 57.16 mph (91.99 km/h) |
| 70 mph (112.65 km/h) | 61.56 mph (99.07 km/h) |
| 75 mph (120.7 km/h) | 65.95 mph (106.14 km/h) |
| 80 mph (128.75 km/h) | 70.35 mph (113.22 km/h) |
| 85 mph (136.79 km/h) | 74.75 mph (120.3 km/h) |
| 90 mph (144.84 km/h) | 79.15 mph (127.37 km/h) |
| 95 mph (152.89 km/h) | 83.54 mph (134.45 km/h) |
| 100 mph (160.93 km/h) | 87.94 mph (141.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
