Replace your helmet after any crash, even a minor one

A bicycle helmet should be replaced when ready after any impact to the head, regardless of whether you see visible damage. The foam inside the helmet — the part that actually protects you — compresses during a crash to absorb energy. Once compressed, that foam cannot return to its original density and will not protect you the same way in a second impact.

This is true even if the helmet looks fine on the outside. The damage is often internal. A helmet that has taken one hard hit may feel normal to wear, but the protection it offers has been permanently reduced. Wearing it again puts you at real risk.

If you are unsure whether an impact was hard enough to damage the helmet, replace it anyway. The cost of a new helmet is far less than the cost of a head injury.

Key Takeaways

  • Replace your helmet when ready after any crash or impact to the head, even if there is no visible damage to the shell.
  • The protective foam inside a helmet compresses permanently during impact and cannot be restored by cleaning or repair.
  • Most helmets last three to five years with normal use, even without a crash, because the foam and straps degrade over time.
  • Visible cracks, dents, loose straps, or a cracked visor are all signs that a helmet should be replaced right away.
  • Store your helmet in a cool, dry place away from direct sunlight, which breaks down the foam and plastic faster.

Signs of wear that mean it is time for a new helmet

Beyond crash damage, several visible signs tell you a helmet has reached the end of its life. Look for cracks or deep dents in the outer shell, even if they seem small. Check the foam layer underneath — if it is compressed, crumbly, or visibly thinner than it was when new, the helmet no longer protects properly.

Inspect the straps and buckle system. If the straps are frayed, torn, or no longer hold the helmet snugly under your chin, replace the helmet. A loose helmet will shift during a fall and may not cover the impact area. The chin strap buckle should click firmly and hold without slipping; if it is cracked or the mechanism is loose, the helmet cannot stay in place.

Check the visor or brim if your helmet has one. A cracked visor is not just a cosmetic issue — it can catch on something during a fall and twist the helmet off your head. If the visor is damaged, replace the helmet rather than trying to remove or repair it.

How long a helmet lasts without a crash

Even with careful use and no crashes, a bicycle helmet typically lasts between three and five years. The foam inside breaks down gradually from exposure to heat, humidity, and sunlight. The plastic shell becomes brittle. The straps lose elasticity and may crack at stress points.

If you ride regularly in hot weather or store your helmet in a car or garage where temperatures fluctuate, the helmet may degrade faster. If you ride only occasionally and store it indoors in a cool, dry place, it may last closer to five years. Check your helmet every season — if the foam feels softer or more compressed than you remember, or if the straps have become stiff and cracked, it is time to replace it.

Write the purchase date on the inside of your helmet with a permanent marker so you can track how old it is. This makes it easier to remember when you bought it and when you should consider replacing it.

How to store your helmet to extend its life

Where you keep your helmet matters. Store it in a cool, dry place — ideally indoors at room temperature. Avoid leaving it in a hot car, a garage that gets very cold in winter, or anywhere exposed to direct sunlight for long periods. Heat and UV light break down the foam and plastic faster than normal aging.

Do not hang your helmet by the straps for months at a time, as this stretches them out and can stress the attachment points. Instead, place it on a shelf or in a helmet bag. If you need to transport it, use a padded bag or case to protect it from bumps and pressure.

Clean your helmet gently with mild soap and water, then dry it completely before storing. Do not use harsh chemicals, solvents, or high-pressure water, as these can damage the foam and weaken the shell. Never try to repair a damaged helmet with glue, tape, or paint — these do not restore the protective properties and may make it worse.

What not to do with a damaged helmet

Do not attempt to repair a cracked or dented helmet. Gluing, taping, or painting over damage does not restore the foam's ability to absorb impact. The helmet may look fixed but will not protect you. Some people try to sand down dents or fill cracks with epoxy — this is not safe and wastes money that should go toward a new helmet.

Do not keep wearing a helmet after a crash just because you cannot afford a new one right away. If you cannot replace it when ready, avoid riding until you have a new helmet. A single additional crash while wearing a compromised helmet could result in serious injury.

Do not assume that because a helmet is expensive it will last longer or recover from damage. Price does not change how foam works. A $300 helmet that has been in a crash is just as damaged as a $50 helmet that has been in the same crash.

Choosing a replacement helmet

When you buy a new helmet, look for one that fits snugly but comfortably. It should sit level on your head, not tilted back or forward. The straps should form a V-shape under your ears when fastened, and the chin strap should be tight enough that you cannot fit more than one finger underneath it.

Check that the helmet meets safety standards for your region. In the United States, look for a CPSC (Consumer Product Safety Commission) sticker inside the helmet. In Canada, look for a CSA mark. In Europe, look for a CE mark. These certifications mean the helmet has been tested and meets minimum safety requirements.

You do not need to buy the most expensive helmet on the market. A mid-range helmet that fits well and meets safety standards will protect you just as well as a premium model. What matters most is that you wear it every time you ride and replace it when it is damaged or worn out.

Frequently Asked Questions

Can I repair a helmet instead of replacing it?

No. Once the foam inside is compressed or cracked, it cannot be restored to its original protective state. Glue, tape, or epoxy do not restore the foam's ability to absorb impact. A repaired helmet will not protect you in a crash the way a new one will.

Does a helmet need to be replaced if I dropped it but did not hit my head?

If the helmet itself hit the ground hard enough to cause visible damage or denting, replace it. If it was a light drop with no damage to the shell or foam, it is probably fine. When in doubt, replace it — the cost is worth the safety.

How do I know if the foam inside is damaged if I cannot see it?

Press gently on the outside of the helmet. The foam should feel firm and spring back slightly. If it feels soft, mushy, or does not bounce back, the foam has degraded and the helmet should be replaced. You can also look inside through the ventilation holes with a flashlight.

Is an old helmet still better than no helmet?

A helmet that is five or six years old with no crash history is better than nothing, but it is not ideal. The foam has degraded over time and will not protect as well as a new helmet. If you are still using an old helmet, prioritize replacing it soon.

What should I do with my old helmet after I replace it?

Some bike shops accept old helmets for recycling. Check with your local shop. Do not donate a damaged helmet to someone else — they need to know it has been compromised. If recycling is not available, throw it away in the trash.