Electric bike use has reshaped the transportation system in a large number of cities in China. The massive adaptation of e-bikes along with regular bicycles presents challenges common to other modes of transportation. This paper investigates e-bike use over six years with four bi-annual travel diary surveys of e-bike users between 2006 and 2012 in Kunming, China. Choice models were developed to investigate factors influencing mode-transition and motorization pathways. This effort is meant to identify how to use characteristics or demographics of users change over time and found that unobserved changes occur over time. This paper models these changes over time and introduces a mode-transition model, providing insights into how e-bikes could disrupt the traditional motorization pathway.