For vehicles equipped with continuous variable transmissions (CVT) higher standards regarding noise and vibration reduction are demanded. Research by Bosch Transmission Technology (Bosch) has shown that there is a relation between noise and vibrations originating from the differential of the driveline and pushpart vibrations inside the CVT. Although the cause of these vibrations is known, sufficient knowledge is not available to improve the design of the CVT in such way that these driveline vibrations are prevented or reduced. In this thesis, performed at Bosch, new insights are gained on the vibration of the pushpart of the pushbelt by doing frequency measurements and a modal analysis. With these new insights an attempt is made to formulate a model for calculating the frequency of the occurring vibrations. This attempt resulted in finding a direct relation between the frequency response and compression stiffness of the pushpart.