Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/50-15 | 185/40-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.28 (566) | 20.83 (529) | -1.46 (-37) -6.5% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 70.01 (1778.14) | 65.43 (1661.9) | -4.58 (-116.24) -6.5% |
| Sidewall Height inches (mm) | 3.64 (92.5) | 2.91 (74) | -0.73 (-18.5) -20% |
| Revolutions per mile (km) | 905.07 (562.38) | 968.37 (601.72) | 63.3 (39.33) 7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.69 mph (30.08 km/h) |
| 25 mph (40.23 km/h) | 23.37 mph (37.6 km/h) |
| 30 mph (48.28 km/h) | 28.04 mph (45.12 km/h) |
| 35 mph (56.33 km/h) | 32.71 mph (52.64 km/h) |
| 40 mph (64.37 km/h) | 37.39 mph (60.17 km/h) |
| 45 mph (72.42 km/h) | 42.06 mph (67.69 km/h) |
| 50 mph (80.47 km/h) | 46.73 mph (75.21 km/h) |
| 55 mph (88.51 km/h) | 51.4 mph (82.73 km/h) |
| 60 mph (96.56 km/h) | 56.08 mph (90.25 km/h) |
| 65 mph (104.61 km/h) | 60.75 mph (97.77 km/h) |
| 70 mph (112.65 km/h) | 65.42 mph (105.29 km/h) |
| 75 mph (120.7 km/h) | 70.1 mph (112.81 km/h) |
| 80 mph (128.75 km/h) | 74.77 mph (120.33 km/h) |
| 85 mph (136.79 km/h) | 79.44 mph (127.85 km/h) |
| 90 mph (144.84 km/h) | 84.12 mph (135.37 km/h) |
| 95 mph (152.89 km/h) | 88.79 mph (142.89 km/h) |
| 100 mph (160.93 km/h) | 93.46 mph (150.41 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
