Since the first, completely dilapidated and old bicycles of American newspaper boys were modified for mountains, gravel and forests, mountain biking has been all about defying tradition and improving riding. And every new driving style needs a perfect solution. EX1 is the world's first drive system specially developed for the unique requirements of e-mountain bikes. With the proven SRAM 1x™ technology as its DNA, the EX1 cassette forms the heart of this group. It enables optimum gear steps for more targeted shifting and the best ratio for mid-motor E-MTBs. Each EX1 component is designed to complement the system perfectly. The result is smoother running, intuitive shifting, longer battery life and greater durability. EX1 opens the door to a beautiful new world of mountain biking.