Coverage robot mobility

An autonomous coverage robot comprising:na body defining a chamber;a drive system disposed on the body and configured to maneuver the robot over a work surface; anda cleaning assembly carried by the body, the cleaning assembly comprising:nfirst and second cleaning rollers rotatably coupled to the body within the chamber such that a wall of the chamber is positioned above an interface between the cleaning rollers and extends above an adjacent one of the cleaning rollers to define a passage between the chamber wall and the adjacent cleaning roller, wherein a leading portion of the chamber wall, in a direction of forward travel of the body, comprises a curved surface having a substantially constant radius that follows the circumference of the first cleaning roller at a substantially constant clearance;a suction duct in communication with the passage and disposed adjacent at least one of the cleaning rollers, the suction duct configured to receive debris dynamically lifted from the work surface between the cleaning rollers, through the passage towards the suction duct; anda container in fluid communication with the suction duct and configured to collect the debris drawn into the suction duct.