https://www.ifixit.com/Parts/iRobot_Roomba_620/Casters_and_Wheels
iRobot Roomba 620 Casters and Wheels | iFixit
iFixit has you covered with parts, tools, and free repair guides. Repair with confidence! All of our replacement parts are tested to rigorous standards and...
irobot roomba 620casters and wheelsifixit
https://www.ifixit.com/en-eu/products/irobot-roomba-614-618-620-621-630-635-640-760-761-770-780-790-beater-brush
iRobot Roomba 614, 618, 620, 621, 630, 635, 640, 760, 761, 770, 780, 790 Beater Brush
Replace worn out beater brush bar for select models of Roomba Vacuums.