When you drive your car the suspension goes through a bound and rebound cycle with the springs compressing (bound) and expanding (rebound). This is a continuous process over ever inch of road you travel. This range of motion creates toe changes. Toe change alters your steering and causes your front tires to wear out faster. Proper wheel alignment and modest changes to your suspension can radically reduce toe change and bump steer. www.PeddersUSA.com
Here's a very quick explanation on how the proper geometry for IFS is setup.
Steering Geometry - Camber , Caster , King pin inclination , toe in , toe out
The three major alignment parameters on a car are toe, camber, and caster. Most enthusiasts have a good understanding of what these settings are and what they involve, but many may not know why a particular setting is called for, or how it affects performance. Let's take a quick look at this basic aspect of suspension tuning
Investigating Bump Steer
Lets have a look at what is bump steer and what causes it