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Also, can any one explain simply, what a positive caster does for handling?

Thanks.



The more positive caster a front end has, the more it "wants" to point straight ahead. What this also means is that it takes more effort to turn it away from straight ahead. When vintage Mopars were originally built, one of the perceived benefits of engineering cars and creating alignment specs with little (or negative) caster was reduced steering effort. Concern with better stability and handling trumps that in today's world.

Another analogy for positive caster stability would be riding a bicycle. Bikes generally have positive caster. If you extend an imaginary line through the steering pivot (the front frame tube holding the fork/handlebars), that line intersects the ground forward of a vertical line through the axle shaft. Because of this, the wheel "wants" to stay straight and track "behind" the imaginary pivot line. This is why, at speed, one can ride a bike without even holding the handlebars.