Steering Axis Inclination: What It Is and Why It Matters

 

Steering Axis Inclination (SAI): What It Is and Why It Matters

Steering Axis Inclination (SAI) is the angle at which the steering axis of a vehicle is tilted from the vertical. It is an important factor in determining the vehicle's handling characteristics.

SAI is measured in degrees, and it can be either positive or negative. A positive SAI means that the steering axis is tilted towards the front of the vehicle, while a negative SAI means that it is tilted towards the rear.

The amount of SAI that a vehicle has is determined by a number of factors, including the vehicle's suspension design, the type of tires that are used, and the vehicle's weight distribution.

SAI affects a number of vehicle handling characteristics, including:

• Straight-line stability: SAI helps to keep the vehicle traveling in a straight line. If the SAI is too low, the vehicle may wander or drift.
• Cornering ability: SAI helps the vehicle to turn corners smoothly. If the SAI is too high, the vehicle may understeer, which means that it will push straight ahead instead of turning.
• Tire wear: SAI can affect tire wear. If the SAI is too low, the tires may wear unevenly.

SAI is an important factor in vehicle handling, and it is something that should be considered when choosing a vehicle. If you are not sure what the SAI of your vehicle is, you can ask your mechanic.