Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/45-15 | 185/40-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.56 (547.5) | 20.83 (529) | -0.73 (-18.5) -3.4% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 67.72 (1720.02) | 65.43 (1661.9) | -2.29 (-58.12) -3.4% |
| Sidewall Height inches (mm) | 3.28 (83.25) | 2.91 (74) | -0.36 (-9.25) -11.1% |
| Revolutions per mile (km) | 935.65 (581.39) | 968.37 (601.72) | 32.72 (20.33) 3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.32 mph (31.1 km/h) |
| 25 mph (40.23 km/h) | 24.16 mph (38.87 km/h) |
| 30 mph (48.28 km/h) | 28.99 mph (46.65 km/h) |
| 35 mph (56.33 km/h) | 33.82 mph (54.42 km/h) |
| 40 mph (64.37 km/h) | 38.65 mph (62.2 km/h) |
| 45 mph (72.42 km/h) | 43.48 mph (69.97 km/h) |
| 50 mph (80.47 km/h) | 48.31 mph (77.75 km/h) |
| 55 mph (88.51 km/h) | 53.14 mph (85.52 km/h) |
| 60 mph (96.56 km/h) | 57.97 mph (93.3 km/h) |
| 65 mph (104.61 km/h) | 62.8 mph (101.07 km/h) |
| 70 mph (112.65 km/h) | 67.63 mph (108.85 km/h) |
| 75 mph (120.7 km/h) | 72.47 mph (116.62 km/h) |
| 80 mph (128.75 km/h) | 77.3 mph (124.4 km/h) |
| 85 mph (136.79 km/h) | 82.13 mph (132.17 km/h) |
| 90 mph (144.84 km/h) | 86.96 mph (139.95 km/h) |
| 95 mph (152.89 km/h) | 91.79 mph (147.72 km/h) |
| 100 mph (160.93 km/h) | 96.62 mph (155.5 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
