Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/75-17 | 185/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.33 (694.3) | 28.01 (711.5) | 0.68 (17.2) 2.5% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 85.87 (2181.21) | 88 (2235.24) | 2.13 (54.04) 2.5% |
| Sidewall Height inches (mm) | 5.17 (131.25) | 4.01 (101.75) | -1.16 (-29.5) -22.5% |
| Revolutions per mile (km) | 737.82 (458.46) | 719.99 (447.38) | -17.84 (-11.08) -2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.5 mph (32.98 km/h) |
| 25 mph (40.23 km/h) | 25.62 mph (41.23 km/h) |
| 30 mph (48.28 km/h) | 30.74 mph (49.48 km/h) |
| 35 mph (56.33 km/h) | 35.87 mph (57.72 km/h) |
| 40 mph (64.37 km/h) | 40.99 mph (65.97 km/h) |
| 45 mph (72.42 km/h) | 46.11 mph (74.21 km/h) |
| 50 mph (80.47 km/h) | 51.24 mph (82.46 km/h) |
| 55 mph (88.51 km/h) | 56.36 mph (90.71 km/h) |
| 60 mph (96.56 km/h) | 61.49 mph (98.95 km/h) |
| 65 mph (104.61 km/h) | 66.61 mph (107.2 km/h) |
| 70 mph (112.65 km/h) | 71.73 mph (115.45 km/h) |
| 75 mph (120.7 km/h) | 76.86 mph (123.69 km/h) |
| 80 mph (128.75 km/h) | 81.98 mph (131.94 km/h) |
| 85 mph (136.79 km/h) | 87.11 mph (140.18 km/h) |
| 90 mph (144.84 km/h) | 92.23 mph (148.43 km/h) |
| 95 mph (152.89 km/h) | 97.35 mph (156.68 km/h) |
| 100 mph (160.93 km/h) | 102.48 mph (164.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1832 | 2129 | 2292 | 2394 | 2503 | 2581 | 2666 | 2768 | 2908 | 3049 | 3204 | 3329 | 3555 | 3805 | 4000 | 4124 | 4195 | 4452 | 4811 | 5590 |
Better Fuel Economy Factory Ratios Increased Power
