The Gates CDX belt drive system is more durable than a standard chain, virtually maintenance-free and almost silent while you're riding;Trek's Removable Integrated Battery (RIB) system looks great and is super user-friendly: it fully hides the battery in the frame and makes it easy to remove the battery without tools;The internally-geared Shimano Nexus hub is low-maintenance and easy to use;The suspension seatpost and fork absorb fatiguing bumps in the road;