Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/55-18 | 175/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.01 (660.7) | 25.58 (649.7) | -0.43 (-11) -1.7% |
| Width inches (mm) | 7.28 (185) | 6.89 (175) | -0.39 (-10) -5.4% |
| Circum. inches (mm) | 81.72 (2075.65) | 80.36 (2041.09) | -1.36 (-34.56) -1.7% |
| Sidewall Height inches (mm) | 4.01 (101.75) | 3.79 (96.25) | -0.22 (-5.5) -5.4% |
| Revolutions per mile (km) | 775.34 (481.78) | 788.47 (489.93) | 13.13 (8.16) 1.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.67 mph (31.65 km/h) |
| 25 mph (40.23 km/h) | 24.58 mph (39.56 km/h) |
| 30 mph (48.28 km/h) | 29.5 mph (47.48 km/h) |
| 35 mph (56.33 km/h) | 34.42 mph (55.39 km/h) |
| 40 mph (64.37 km/h) | 39.33 mph (63.3 km/h) |
| 45 mph (72.42 km/h) | 44.25 mph (71.21 km/h) |
| 50 mph (80.47 km/h) | 49.17 mph (79.13 km/h) |
| 55 mph (88.51 km/h) | 54.08 mph (87.04 km/h) |
| 60 mph (96.56 km/h) | 59 mph (94.95 km/h) |
| 65 mph (104.61 km/h) | 63.92 mph (102.87 km/h) |
| 70 mph (112.65 km/h) | 68.83 mph (110.78 km/h) |
| 75 mph (120.7 km/h) | 73.75 mph (118.69 km/h) |
| 80 mph (128.75 km/h) | 78.67 mph (126.6 km/h) |
| 85 mph (136.79 km/h) | 83.58 mph (134.52 km/h) |
| 90 mph (144.84 km/h) | 88.5 mph (142.43 km/h) |
| 95 mph (152.89 km/h) | 93.42 mph (150.34 km/h) |
| 100 mph (160.93 km/h) | 98.34 mph (158.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2007 | 2331 | 2510 | 2621 | 2741 | 2826 | 2920 | 3031 | 3185 | 3338 | 3509 | 3646 | 3893 | 4167 | 4380 | 4517 | 4594 | 4875 | 5268 | 6122 |
Better Fuel Economy Factory Ratios Increased Power
