DEFINITION: The tire/wheel bounce with a frequency directly related to vehicle speed.

Tire/wheels are unbalanced

Balance the tire/wheels. Refer to Tire and Wheel Assembly Balancing - Off Vehicle in Vibration Diagnosis and Correction.

Tire exhibits a blister or bump

Replace the tire. Refer to Tire Mounting and Dismounting in Tires and Wheels.

Improper strut/shock absorber action

Replace the strut/shock absorber.

Excessive wheel or tire runout

Refer to Tire and Wheel Assembly Runout Measurement - Off Vehicle in Vibration Diagnosis and Correction.

Tire lead/pull

Refer to Radial Tire Lead/Pull Correction in Tires and Wheels.