Neutop Replacement Front Caster Ball Wheel Tire Kit Compatible with iRobot Roomba 500, 600, 700, 800, 900, e and i Series Models.: Amazon.com: Industrial & Scientific
Replacement Roomba Front Wheel Caster Assembly for iRobot Roomba i7 i7+ Plus E5 E6 E7 500 600 700 800 900 Series Roomba Vacuum - AliExpress
How to Clean the Front Caster Wheel | Roomba® i and e series | iRobot® - YouTube