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What is Bump Steer?

Bump Steer gets its name from just that...undesirable steering while going through bumps. A good way to check this is to set your race-ready car on a completely flat surface (race ready meaning with the battery installed). Slowly press down on the front of the car. Does the angle of the front tires switch from toe-straight to toe-in or out? If so, then you will experience Bump Steer!  This effect will cause the car to bounce back and forth through bumpy track sections, instead of going straight!

How do you change Bump Steer?

As a general rule, this should work for all cars (assuming you have 2° of kickup):

• 0° of caster, add a .100" spacer under the front ball stud on both steering knuckles.

• 2° of caster, add a .060" spacer under the front ball stud on both steering knuckles

• 4° of caster, add a .030" spacer under the front ball stud on both steering knuckles.

You should change the Bump Steer EVERY time you change your caster.