Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/45-15 | 175/40-14 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.2 (538.5) | 19.51 (495.6) | -1.69 (-42.9) -8% |
| Width inches (mm) | 6.89 (175) | 6.89 (175) | 0 (0) 0% |
| Circum. inches (mm) | 66.6 (1691.75) | 61.3 (1556.97) | -5.31 (-134.77) -8% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 2.76 (70) | -0.34 (-8.75) -11.1% |
| Revolutions per mile (km) | 951.29 (591.1) | 1033.64 (642.27) | 82.35 (51.17) 8.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.41 mph (29.62 km/h) |
| 25 mph (40.23 km/h) | 23.01 mph (37.03 km/h) |
| 30 mph (48.28 km/h) | 27.61 mph (44.43 km/h) |
| 35 mph (56.33 km/h) | 32.21 mph (51.84 km/h) |
| 40 mph (64.37 km/h) | 36.81 mph (59.25 km/h) |
| 45 mph (72.42 km/h) | 41.42 mph (66.65 km/h) |
| 50 mph (80.47 km/h) | 46.02 mph (74.06 km/h) |
| 55 mph (88.51 km/h) | 50.62 mph (81.46 km/h) |
| 60 mph (96.56 km/h) | 55.22 mph (88.87 km/h) |
| 65 mph (104.61 km/h) | 59.82 mph (96.27 km/h) |
| 70 mph (112.65 km/h) | 64.42 mph (103.68 km/h) |
| 75 mph (120.7 km/h) | 69.03 mph (111.09 km/h) |
| 80 mph (128.75 km/h) | 73.63 mph (118.49 km/h) |
| 85 mph (136.79 km/h) | 78.23 mph (125.9 km/h) |
| 90 mph (144.84 km/h) | 82.83 mph (133.3 km/h) |
| 95 mph (152.89 km/h) | 87.43 mph (140.71 km/h) |
| 100 mph (160.93 km/h) | 92.03 mph (148.11 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
