Marbles are small rubber pieces off the racing groove. Tires shed rubber during heavy cornering loads. Loose fragments collect outside the main groove. Driving through marbles reduces tire grip quickly. Cars slide when tires touch the debris. Drivers avoid marbles during close racing battles. Spotters warn drivers about marbles near the wall. For example a driver lost control after hitting marbles high. That mistake occurred during a late race pass attempt. Teams plan passes within the clean groove area. Clean tires maintain better corner stability. Awareness of marbles prevents sudden traction loss. Track evolution increases marble buildup over time.
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