Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/80-14 | 180/40-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.34 (643.6) | 20.67 (525) | -4.67 (-118.6) -18.4% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 79.6 (2021.93) | 64.93 (1649.34) | -14.67 (-372.59) -18.4% |
| Sidewall Height inches (mm) | 5.67 (144) | 2.83 (72) | -2.83 (-72) -50% |
| Revolutions per mile (km) | 795.94 (494.58) | 975.75 (606.3) | 179.81 (111.73) 22.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.31 mph (26.26 km/h) |
| 25 mph (40.23 km/h) | 20.39 mph (32.82 km/h) |
| 30 mph (48.28 km/h) | 24.47 mph (39.38 km/h) |
| 35 mph (56.33 km/h) | 28.55 mph (45.95 km/h) |
| 40 mph (64.37 km/h) | 32.63 mph (52.51 km/h) |
| 45 mph (72.42 km/h) | 36.71 mph (59.08 km/h) |
| 50 mph (80.47 km/h) | 40.79 mph (65.64 km/h) |
| 55 mph (88.51 km/h) | 44.86 mph (72.2 km/h) |
| 60 mph (96.56 km/h) | 48.94 mph (78.77 km/h) |
| 65 mph (104.61 km/h) | 53.02 mph (85.33 km/h) |
| 70 mph (112.65 km/h) | 57.1 mph (91.89 km/h) |
| 75 mph (120.7 km/h) | 61.18 mph (98.46 km/h) |
| 80 mph (128.75 km/h) | 65.26 mph (105.02 km/h) |
| 85 mph (136.79 km/h) | 69.34 mph (111.59 km/h) |
| 90 mph (144.84 km/h) | 73.42 mph (118.15 km/h) |
| 95 mph (152.89 km/h) | 77.49 mph (124.71 km/h) |
| 100 mph (160.93 km/h) | 81.57 mph (131.28 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
