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Why do bike helmets expire?

Author

Matthew Perez

Updated on May 17, 2026

There are a lot of things that degrade over time, like the foam and glue used in the helmet. Your body oils, sweat and UV rays also take a toll on the material, and after five years, it is for sure compromised and not offering the intended level of protection.

Do bicycle helmets expire?

The government testing body in the US, the Consumer Product Safety Commission (CPSC), recommends replacing a bicycle helmet every five to 10 years. The Snell Memorial Foundation, which also certifies helmets for safety, states a firm five years.

Can you wear an expired helmet?

Helmets have a limited lifespan because the resin and other materials used in the manufacturing process over time can be effected by your body fluids, hair oils, ultraviolet light and normal wear and tear. It is prudent advice to replace your helmet 5 years after purchase or 7 years after the production date.

Why do helmets have an expiration date?

In general, yes: Helmets have an expiration date. That's because exposure to sunlight, heat, and other elements degrades the foam and other parts of the helmet. Plus, helmets tend to get knocked around with use. You don't want to mess around with something designed to save your life.

Do bike helmets degrade?

The short answer is yes. Just like all plastic materials, bike helmets do eventually degrade. But the rate at which bike helmets degrade, is so insignificant, you will most likely never notice. And other than making for a stinky environment, sweat does not burn through your helmets plastic like some may think.

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What do you do with an expired bike helmet?

Most local recycling programs don't want mixed materials. So your best solution may be to take the helmet apart, put the plastic shell in your plastic recycling, break up the EPS foam for use as packing material or a soil amendment, and pitch the strap and buckle in the trash.

How often should cycling helmets be replaced?

A cycling helmet is generally good for around 5 years, after that, you will want to replace your bike helmet. This is because the polystyrene foam that protects you degrades over time, mainly as a result of UV exposure to sunlight.

Do DOT approved helmets expire?

Yes, motorcycle helmets do have definite expiration dates and could become less effective in the event of an auto accident. Ask yourself these questions to determine whether or not it's time for a replacement.

What does dot mean on a helmet?

DOT-certified helmets are designed to protect the head during most types of motorcycle crash impacts. The helmets are tested under conditions that simulate a moderate impact at up to 250 times the force of gravity (250g). DOT helmets are designed to absorb the force of the crash rather than resisting the impact.

Do Kevlar helmets expire?

Ballistic helmets and armor, in general, will degrade over time due to many different variables. The big ones being use, how they are taken care of, and of course materials and manufacturing processes.

Do bicycle helmets expire Australia?

Helmets have a limited lifespan in use and should be replaced when they show obvious signs of wear. Additionally, helmet parts lose strength over time, so even if the helmet has not been impacted or damaged, we recommend replacing it after three years.

How long are HJC helmets good for?

Due to UV damage, adhesive and component aging, and other, HJC recommends changing a helmet every 3 to 5 years.

Should I replace my bike helmet after a crash?

A rule most safety supervisors and manufacturers emphasize on following strictly is replacing a bike helmet immediately after a crash. One should remember that bike helmets are designed to absorb force upon impact, which may cause the inner foam to be damaged even if the exterior bounces back to its usual appearance.

Are MIPS helmets worth it?

The results of the study showed that the MIPS and SPIN helmets were more successful in reducing the risk of brain trauma and injuries by 42% and 54% respectively. Another study was published in May 2021 to determine the effectiveness of new bike helmet technologies in mitigating brain injuries caused by oblique forces.

Can I remove the DOT sticker from my helmet?

You can now remove the approval certificate sticker on the outside of your helmet, but you still need to have an internal certificate label or sticker to avoid a fine from a copper who thinks they know the law better than you.

How do you certify a helmet?

There are four separate tests that a helmet must pass to qualify for DOT certification. A helmet must pass an impact test, a penetration test, a retention strap test, and a peripheral vision test.

What does Snell mean on a helmet?

Helmets are certified only after meeting all test requirements at the Snell lab. Then, samples of certified helmets sold to consumers are bought randomly from retailers for more compliance testing. Snell certified helmets means high impact management and premium head protection.

Where is the manufacture date on a helmet?

However, some types of helmets are manufactured which have some numbers written on the stripes or buckles, which is used to indicate that the helmet has been manufactured. The way 03/07 is written, it means that it was created in the month of March 2007.

How long does a MTB helmet last?

Crashes aside, many bike helmet manufacturers recommend replacing your helmet every three to five years.

What is a MIPS bike helmet?

Mips uses a slip-plane system that moves inside the helmet, mimicking the brain's own protection system. This layer is designed to rotate inside the helmet with the intent to potentially slow or reduce the amount of energy transferred to or from the head.

How often should riding hats be replaced?

Should I replace it? Most manufacturers recommend replacing your riding hat after 2000 hours. Roughly, this equates to around 5 years for the average rider, but if you ride professionally you may want to try to calculate your usage more accurately.

Can I use a bike helmet for skiing?

In order to get the most protection from your helmet, it's important that it fit properly. First of all, never use a bicycle helmet or skateboarding helmet; they are not designed for skiing or snowboarding. Your helmet should be snug, but not tight.

Do I need to replace my helmet after a fall?

You should always replace your helmet after an accident or a fall where your helmet has suffered an impact (i.e., hitting the ground). Most manufacturers recommend replacing your helmet after 5 years of use regardless.

What does HJC helmets stand for?

HJC is short for Hong Jin Crown Company, a South Korean firm that started making riot and safety helmets back in 1971. They're known for producing good value low and mid-priced helmets that often offer some pretty innovative and useful features.