When should I replace my road cycling helmet?

Replace your helmet immediately after any crash where the helmet contacts the ground or another object, even if no damage is visible—EPS foam compresses on impact and does not recover. Replace the helmet every 3-5 years even without crashes, as UV exposure, sweat, and temperature cycling gradually degrade the foam's impact absorption. Also replace if you notice cracks in the shell, separation between shell and foam, frayed straps, or a retention system that no longer holds adjustment. When in doubt, replace—it's your head.