A bale chamber of an agricultural round baler. The bale chamber includes a main frame, a plurality of rollers, and at least one belt engaging with at least one roller of the plurality of rollers. The at least one belt and the plurality of rollers are together configured for creating a round circulating chamber. The bale chamber also includes a subframe movably connected to the main frame and at least one follower roller pivotally connected to the subframe at a first pivot axis. The at least one follower roller engages with the at least one belt. The subframe is configured for moving during formation of the bale so that the at least one follower roller moves in between a first position at the empty bale position of the circulating chamber and a second position at the full bale position of the circulating chamber.