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What we call bump steer in RC car racing describes something in the front of the car more than the rear. It usually results from too little caster in the front suspension and incorrect ackerman angle. If the rear of your car is stepping out during cornering over bumps then you are suffering from inadequate damping on the rear. The dampers are not absorbing enough of the bump to keep the rear tire in contact with the road. This can be changed by altering the spring rates and the rebound of the damper.
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