What speed does your motor stop helping at? That question beats any brand name when you're shopping for an e-bike helmet. Class 3 e-bikes can assist up to 28 mph. So the crash energy you're planning for changes (RideLumos). Above 20 mph, NTA 8776 is the certification to look for. Virginia Tech STAR ratings compare tested impact performance. MIPS handles rotational forces. Fit decides whether any of that matters on your head.
Match the Helmet to Your E-Bike Class
In the U.S., Class 1 and Class 2 e-bikes cut motor assistance at 20 mph. A CPSC helmet meets the legal minimum for bicycles. EN 1078 does the same job in Europe. Neither standard was written with 28 mph commuting in mind. NTA 8776 was. According to ACT Lab, it tests impacts up to 45 km/h (about 28 mph) and sets a 250 g maximum force on the head. The Beam notes that the standard also includes cold, hot, and rain conditioning.
That detail sounds small. It isn't. Foam and shells don't behave the same at 0 C as they do inside a shop. You don't need to memorize the test cycles. You just need to know which standard matches your bike's assist limit.
If your commute mixes bike lanes with stretches above 30 km/h, the extra weight of an NTA-certified helmet is usually worth carrying. Helmet laws are separate. They vary by state and country. Check your local rules before assuming a helmet is optional.
Virginia Tech STAR Ratings: Useful, But Narrow
Virginia Tech's STAR method drops helmets into linear and rotational test conditions. Then it converts the results into a 1-5 star rating. That sounds simple enough. A five-star score isn't magic. It means the model performed well in that lab setup. Raw scores within the five-star group still vary. So don't assume any two five-star helmets are equals. Turns out price doesn't track safety perfectly either. One third-party roundup of the database references 304 tested helmets and notes that some $200-plus helmets sit in the middle of the table below cheaper picks, according to Top 100 Sales.
Ratings are model-specific. A brand's other helmet may score very differently. Verify the exact model on the current Virginia Tech database or a source that mirrors it. The star rating is a screening tool, not a purchase order. It can help you build a shortlist, but it won't tell you whether the shape fits your skull.
Sweet Protection says seven of its models hold five-star Virginia Tech ratings. That's a manufacturer claim tied to those specific models. It is not a blanket rule for every helmet wearing the logo (Sweet Protection).
NTA 8776 vs CPSC and EN 1078
| Standard | What it covers | Best for |
|---|---|---|
| CPSC | U.S. baseline for bicycle helmets | Class 1-2 e-bikes at up to 20 mph, casual riding |
| EN 1078 | European baseline for bicycle and skateboard helmets | Similar low-speed use, legal minimum in many places |
| NTA 8776 | E-bike and speed pedelec impacts up to 45 km/h, 250 g peak, expanded coverage | Class 3 e-bikes, speed pedelecs, faster commuting |
Don't read the table as a ranking. Treat it as a matching exercise. CPSC and EN 1078 still matter. They meet legal minimums for ordinary bicycle use. NTA 8776 covers a different, faster impact case. If your bike assists to 25 km/h or more, The Beam puts it bluntly: stop shopping the basic aisle and go straight to an NTA 8776 helmet. For a Class 3 e-bike, an EN 1078 or CPSC lid may satisfy a local bicycle law and still lack the higher-speed test protocol.
What MIPS Adds, and What It Doesn't
Here's what MIPS actually is: a slip-plane system designed to reduce rotational motion during angled impacts. The company says it's based on 25 years of research with KTH Royal Institute of Technology and the Karolinska Institute. The system now appears in more than 1,000 helmet models from over 150 manufacturers (MIPS). Its test lab studies impacts at 6.2 m/s and about 45 degrees because that's a common real-world bike crash pattern (MIPS test lab). Useful engineering, not marketing fluff.
Thing is, MIPS isn't a certification. It can't replace NTA 8776, CPSC, or EN 1078. It's also not the only rotational system out there. Pair it with a high Virginia Tech score and a correct fit, and you're covering more than one failure mode.
Best-For Scenarios Instead of a Single Winner
No single winner exists. Match the gear to the ride.
- Class 3 e-bike at 25-28 mph: prioritize NTA 8776 first, then a 4-5 star Virginia Tech rating, then MIPS or another rotational system.
- Class 1-2 e-bike under 20 mph: a well-fitting CPSC or EN 1078 helmet with a good VT score is reasonable. NTA 8776 gives extra margin.
- Night riding: look for reflective straps or an integrated rear light, but keep using a bike light. Some commuter models from Lumos, Giro, and Bern include visibility features, according to GreenMoov's e-bike helmet roundup.
- Budget shoppers: five-star helmets can cost under $100. A third-party roundup named the P2R A20 MIPS at $55 with a STAR 8.14 score and said eight five-star picks were under $100 (Top 100 Sales). Verify the current score before buying, because the database changes.
Fit Test: Five Checks in Five Minutes
- Measure your head circumference above the eyebrows. Use the maker's size chart.
- Put the helmet on level. The front edge should sit one to two finger widths above your eyebrows.
- Adjust the straps into a V under each ear. You should fit one finger under the chin strap.
- If the helmet uses MIPS, twist the shell side to side. The liner should move independently about 10-15 mm.
- Shake your head. The helmet shouldn't wobble or press hard on one spot.
Fit trumps features. A five-star helmet that slides around won't protect you the way a properly fitted three-star helmet will. Don't skip ratings because of fit, though. Use them as a shortlist, then test the fit in person.
Inspection and Replacement
Give your helmet a look every few months. You're checking for cracks in the shell, crushed foam, frayed straps, and loose pads. Replace it after any impact that involves a hard surface, even if you can't see damage. EPS foam can compress invisibly.
Age is murkier than impact damage, to be honest. Many manufacturers and guides suggest replacing a helmet every three to five years. Storage and use change that math. A helmet stored in a hot car or a damp garage may age faster than one kept indoors. That's another reason to inspect it instead of trusting a calendar alone. Bike-size's replacement guide keeps the advice conservative: ask whether the helmet hit the ground, a car, a tree, a wall, a rack, or another hard object. If yes, replace it. Storage is its own small job. Keep the helmet cool and dry, away from solvents, gasoline, and extreme heat.
FAQ
Are standard bike helmets safe for Class 3 e-bikes? They may meet the legal bicycle helmet standard, but NTA 8776's higher-speed test protocol is a different test. Treat a standard lid as the floor, not a match for 28 mph commuting.
Is NTA 8776 required in the U.S.? No federal U.S. law requires NTA 8776 for e-bike riders. Some states and cities regulate helmet use by age or vehicle class. Check your local rules.
Does MIPS make a helmet safer on its own? It targets rotational motion, which is one piece of crash protection. Pair it with a good fit and a strong Virginia Tech score.
How often should I replace a helmet? Immediately after any hard impact. Otherwise, follow the manufacturer's guidance and inspect regularly. Many sources suggest three to five years.
Before you buy, open the Virginia Tech database and confirm the exact model. Then check for NTA 8776 if your e-bike assists beyond 20 mph. After that, put the helmet on your head. If it fails the five-minute fit test, keep looking.