The Ideal Helmet Standard
Summary: Our ideas for an ideal helmet standard.
There have been almost no advances in bicycle helmet standards in the US since the early 1990's. Why have standards not
improved in a so many years?
Any standard must be practical. A manufacturer must be able to meet it and still sell helmets. The Snell foundation
published a bicycle helmet standard in 1970 requiring a heavy, hot helmet in the motorcycle style. Very few helmets were
ever certified to it, they did not sell at all, and it was quickly forgotten. Upgrading standards is tied to upgrading
protection in a wearable, marketable helmet, and that has not occurred since the early 1990's.
The second constraint on helmet standards is the ability to design an accurate test that can be replicated across
multiple laboratories with uniform results. That limits the parameters that can be tested. How do you design a uniform
test for ease of helmet adjustment, for example, when many subjective factors may be involved. And how do you test for
"strap creep" that permits straps to loosen in use, when they stay adjusted for the rolloff and strap strength tests.
The third major constraint is a lack of precise medical data on exactly what level of protection is required to prevent
either the worst of the brain injuries or the milder concussions that we would all like helmets to prevent. Then there is
the still-perplexing rotational injury component of brain injury, and its relationship to helmet design.
With these limits in mind we still think it is useful to consider what an ideal helmet standard would look like.
Requirements for an Ideal Helmet Standard
1. Energy Management: A single lab test rig design in all labs. Lab drop tests at least 2 meters on all anvils,
with all g's below 150. Variable weight headforms that correspond to the actual weight of the head size. Low impact test
with a 1 meter drop and g's below some defensible number representing minimal risk of concussion, probably below 100.
Most current standards allow higher g's and have no low impact test at all.
2. Strap system: Hold in dynamic yank equal to current standards, but pull off after 3 to 5 seconds of steady pull
to prevent playground hangings. Test for strap creep in use. Durability test for all parts involving thousands of cycles
for the fasteners. Current standards do not include strap creep tests.
3. Fit test: Rolloff test, plus a displacement test with minimal shift on the head permitted. Test for ability to
accommodate most or all head shapes. Use a headform that approximates a real human head, not a magnesium drop test
headform.
4. Comfort tests: Test for minimal ventilation. Weight limit. Limit for restriction of peripheral vision. Perhaps
someday a test for sweat control.
5. Exterior shape: Test for smooth and round exterior without elongated shape or any projections that could snag,
including helmet shell design features. Any accessory mounts or visors must break away readily. Current standards only
limit projections, an approach that has not been effective.
6. Visor and accessory test: Test for shatter resistance of any visor or accessory sold, as well as conformity
with breakaway specification. Test for minimum visor deflection when snagged. Most current standards have no visor
test.
7. Visibility: Test for day and night conspicuity. Not in any current standard.
8. Durability in use: Test for shell scuffing, fitpad rot and sunlight degradation. Not found in current
standards.
9. Cleaning: Test for durability when cleaned with common cleaners. Not in current standards.
10. Instructions: Test for clear, concise, understandable instructions for fitting and use, available in the
native language of the user, with graphic representations.
11. Coverage: Specification for area of coverage that includes 95 percent or more of documented impact locations.
Most current standards are inadequate.
12. Environments: Current conditioning standards are probably adequate for low temp, high temp and wet
testing.
When?
Do we anticipate this ideal standard in any reasonable time frame? No. There have been so few advances in helmet
technology over the last decade, and there is so little incentive for manufacturers to plow money into research and
development, that we would not anticipate helmets that could meet an ideal standard in our lifetime, and probably not in
yours either.
There have also been no major advances in lab testing equipment and protocols over the last decade. Old arguments about
test rig designs have never been settled. No private or public lab is investing in research on major new systems for
improving our testing. No new advances in designing better tests are on the horizon.
Development of an international bicycle helmet standard is stalled. Europe has a test rig that it considers
superior and the US regards as inaccurate and unnecessarily complex. The US uses two different drop rigs that produce slightly different
results and studiously ignores the problem because each rig has its champions who regard the other as inferior, and
because nobody wants to invest in new rigs. The US uses 2 meter drop heights, while Europe uses 1.5 meters, resulting in
helmets that are thinner and usually will not pass US tests. Europe uses a 250 g failure criterion, while the US uses the
same 300 g threshold that it has used for 50 years and can't let go of. In fact
Consumer Reports testing shows
that a good US helmet passes a 250 g test easily. Australia, Canada and others have yet different criteria.
In the absence of better standards, manufacturers are stalled in improving their helmets by two constraints: marketing
and legal liability. They are convinced that they can't sell a helmet that is thicker and therefore bulky looking. And
their lawyers will not let them advertise that a helmet is "safer" or "more protective" or even "designed to prevent
concussion" for fear that they will lose lawsuits when a rider is injured in that helmet.
We are appalled at the pessimism of this conclusion. In the absence of major new initiatives by somebody in the field,
there will not be any significant improvements in helmet performance in the next decade.
Rays of Hope
In 2024 the government of New South Wales in Australia launched a star rating system that is far more comprehensive than any previous star system. The testing corresponds to our views on what an ideal bicycle helmet standard would contain. We have
a page up on it here.
There are other rays of hope: a new group began work in 2002 on providing the medical underpinnings for advances in
standards based on more accurate injury thresholds. For more info, check on our
page on what we
need to make progress. And for concussion data and research we are now indebted to football players, who suffer more
economic loss from concussion than any other population group and are now funding basic research in this field. Results
of that research began to become public in 2004, and over the ensuing decade resulted in improvements in helmet design,
at least for football helmets. The concussion issue is at the forefront of helmet discussion now, but actual progress on
standards is very slow to materialize.