The CDX belt drive by Gates is more robust and durable than a traditional chain, virtually maintenance-free, and almost silent while riding.;The stepless Enviolo CVT hub by NuVinci allows you to seamlessly and automatically glide through an unlimited number of gear ratios.;For easy access to ride information and intuitive operation, the Intuvia display is mounted in the middle of the handlebars.;Trek's Removable Integrated Battery (RIB) looks good and is extremely user-friendly: The battery is fully integrated into the frame and can be easily removed without tools.