Bicycle helmets do not last forever. Today's high tech helmets are meant to break in a crash. The idea is, better the foam plastic helmet than the rider's coconut. If you are involved in a crash while wearing a helmet you should replace the helmet immediately. Do not reuse it, even if it shows no obvious exterior signs of damage. The foam underneath the plastic shell may be damaged enough to reduce it's effectiveness in a subsequent crash.
How hard does a helmet have to hit something to render it useless? German scientists have come up with an innovative way of helping cyclists make that determination. They've created a helmet that smells like stinky cheese when it is cracked to alert you -- and everyone around you -- that it is time for a new one. Smart; but we all knew Germans make good stuff. Check out this innovative Limburger lid by clicking here.
Click here to learn more about when to replace your bike helmet.