How do tires grip the road?
Rubber's Secret Handshake
How do tires grip the road?
Look down at a tire spinning on pavement. Smooth rubber on smooth stone — how does it not just slip and slide like a sock on a kitchen floor? The answer lives in the space between them, a grip so clever it only works because both surfaces are a little bit rough.
Zoom in close, microscope-close, and smooth rubber isn't smooth at all. It's a landscape of tiny hills and valleys, each one smaller than a grain of sand. The road? Same story — even polished pavement is covered in invisible bumps and pits.
