The Alpha Magnetic Spectrometer 02 is a particle detector taking data on the International Space Station since May 19th 2011. A key element of AMS-02 is the Silicon Tracker that allows to determine the trajectory of the charged cosmic rays passing through the AMS-02 magnetic field. In this contribution, we discuss the procedures that from the tracker raw signals allow to reconstruct a full particle trajectory. We discuss how different fitting procedures achieve the best rigidity measurement accuracy in different intervals and we present the overall performance in the rigidity measurement for protons and helium nuclei. Finally we present a technique to reduce the charge confusion.