Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/80-14 | 180/20-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.34 (643.6) | 17.83 (453) | -7.5 (-190.6) -29.6% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 79.6 (2021.93) | 56.03 (1423.14) | -23.57 (-598.79) -29.6% |
| Sidewall Height inches (mm) | 5.67 (144) | 1.42 (36) | -4.25 (-108) -75% |
| Revolutions per mile (km) | 795.94 (494.58) | 1130.84 (702.67) | 334.89 (208.09) 42.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 14.08 mph (22.65 km/h) |
| 25 mph (40.23 km/h) | 17.6 mph (28.32 km/h) |
| 30 mph (48.28 km/h) | 21.12 mph (33.98 km/h) |
| 35 mph (56.33 km/h) | 24.63 mph (39.65 km/h) |
| 40 mph (64.37 km/h) | 28.15 mph (45.31 km/h) |
| 45 mph (72.42 km/h) | 31.67 mph (50.97 km/h) |
| 50 mph (80.47 km/h) | 35.19 mph (56.64 km/h) |
| 55 mph (88.51 km/h) | 38.71 mph (62.3 km/h) |
| 60 mph (96.56 km/h) | 42.23 mph (67.96 km/h) |
| 65 mph (104.61 km/h) | 45.75 mph (73.63 km/h) |
| 70 mph (112.65 km/h) | 49.27 mph (79.29 km/h) |
| 75 mph (120.7 km/h) | 52.79 mph (84.96 km/h) |
| 80 mph (128.75 km/h) | 56.31 mph (90.62 km/h) |
| 85 mph (136.79 km/h) | 59.83 mph (96.28 km/h) |
| 90 mph (144.84 km/h) | 63.35 mph (101.95 km/h) |
| 95 mph (152.89 km/h) | 66.87 mph (107.61 km/h) |
| 100 mph (160.93 km/h) | 70.39 mph (113.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
