Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/50-15 | 185/40.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.28 (566) | 20.97 (532.7) | -1.31 (-33.3) -5.9% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 70.01 (1778.14) | 65.89 (1673.53) | -4.12 (-104.62) -5.9% |
| Sidewall Height inches (mm) | 3.64 (92.5) | 2.99 (75.85) | -0.66 (-16.65) -18% |
| Revolutions per mile (km) | 905.07 (562.38) | 961.65 (597.54) | 56.58 (35.16) 6.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.82 mph (30.29 km/h) |
| 25 mph (40.23 km/h) | 23.53 mph (37.87 km/h) |
| 30 mph (48.28 km/h) | 28.23 mph (45.44 km/h) |
| 35 mph (56.33 km/h) | 32.94 mph (53.01 km/h) |
| 40 mph (64.37 km/h) | 37.65 mph (60.59 km/h) |
| 45 mph (72.42 km/h) | 42.35 mph (68.16 km/h) |
| 50 mph (80.47 km/h) | 47.06 mph (75.73 km/h) |
| 55 mph (88.51 km/h) | 51.76 mph (83.31 km/h) |
| 60 mph (96.56 km/h) | 56.47 mph (90.88 km/h) |
| 65 mph (104.61 km/h) | 61.18 mph (98.45 km/h) |
| 70 mph (112.65 km/h) | 65.88 mph (106.03 km/h) |
| 75 mph (120.7 km/h) | 70.59 mph (113.6 km/h) |
| 80 mph (128.75 km/h) | 75.29 mph (121.17 km/h) |
| 85 mph (136.79 km/h) | 80 mph (128.75 km/h) |
| 90 mph (144.84 km/h) | 84.7 mph (136.32 km/h) |
| 95 mph (152.89 km/h) | 89.41 mph (143.89 km/h) |
| 100 mph (160.93 km/h) | 94.12 mph (151.47 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
