The wheel features evenly distributed tread patterns for stable rolling on wooden floors, tiles and short-pile carpets without slipping or shifting. Moderate shaft clearance creates low rotation resistance, enabling smooth turning and reversing for fluid movement of the robot vacuum. With regular installation dimensions, it fits wheel slots of most robot vacuums and can be mounted or removed by hand without extra tools. Made of soft outer material, it creates gentle friction against door thresholds and furniture bottoms to minimize scratches on floors and furniture. The hollowed-out design facilitates maintenance, preventing hair and debris from jamming gaps; attached residues can be rinsed off easily with clean water.