An intelligent door lock system that permits both electronic and manual control of a deadbolt. The door lock system can include an inner bezel assembly, an outer bezel assembly, and a deadbolt assembly, where the deadbolt assembly can be coupled to the outer bezel assembly via a twist-lock feature. The inner bezel assembly also includes a puck assembly that seats within an inner bezel. The puck assembly can be retained within or released from the inner bezel via a latch assembly. The outer bezel assembly includes a display assembly that seats within an outer bezel. The outer bezel is coupled to a motor chassis assembly that includes a motor and gear assembly having a series of gears that translate movement of dial elements or a motor into movement of a bolt element between locked and unlocked positions.