Rear Cassette An important benefit of building your own bike is the freedom of choice; you can select components that meet your needs, fit your budget, and are compatible with other parts. In this instance, I had the opportunity to choose between the original Shimano 105 (R7000) and the SunRace CS-RX1 rear cassette. Based on my past cycling experiences, I decided to stick with the familiar 11-32T (teeth) ratio; in Taiwan, some mountains are just too steep to tackle with a 28T
