To ensure your suitcase wheels roll smoothly, regular maintenance is key. Start by cleaning them thoroughly after every trip; use a soft brush or a damp cloth to remove hair, dirt, and gravel that often get tangled in the axle. If you notice resistance, apply a small amount of silicone-based lubricant or white lithium grease to the wheel bearings. Avoid WD-40 for long-term use as it can attract more dust over time. Additionally, check for flat spots or uneven wear, which can occur if the bag is frequently dragged over rough pavement rather than being rolled on its four "spinner" wheels. For advanced care, you can unscrew the wheel housing to deep-clean the internal components. Keeping the weight balanced inside your bag also helps distribute pressure evenly across all wheels, preventing premature failure and ensuring a "silky" glide through the airport terminal.