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