Because most of the noise arrives at the neck, not through the shell. Fit, a chin curtain, the screen on your machine and your riding position all matter more than the helmet’s construction — and noise is not a figure any maker publishes.
The four places helmet noise is generated
Turbulent air reaching the space around your neck and under the chin bar, and air passing over vents and seams. Very little of it passes through the shell itself, which is why two helmets can differ enormously while looking equally solid.
The screen, which is usually the real culprit
A screen that ends level with your helmet puts turbulent air exactly at head height. One that is lower, sending air under the helmet, or higher, sending it over, is quieter. Riders who change helmets to fix noise sometimes find the screen was doing it.
Fit, and the gap under the chin
A helmet slightly too large lets air in at the neck and moves at speed, both of which make noise. A chin curtain — often supplied and often removed early because it touches the chin — closes that gap and is the cheapest improvement available.
Position, which changes everything
On a machine that puts you upright, your head is in clean air at the top of the bubble. Tucked, it is in a different flow entirely. The same helmet on two machines is two different noise levels, which is why recommendations from other riders travel badly.
Why no page can rank helmets on this
Noise depends on the head, the helmet, the machine, the screen and the speed. No maker publishes a figure, no two riders measure the same thing, and anything a comparison page claimed here would be invented. What can be reported is construction: seams, vents that close, a chin curtain supplied, and a neck roll.
Where this page and the manufacturer’s own paperwork say different things, the paperwork wins. Every weight, shell size, armour level, approval version, viscosity grade, chain pitch, pad reference and torque figure on this page comes from the maker’s own published figures, with the unit as printed and the source named. None of it is measured here, and no figure is converted into another convention, because a converted number is a different number. And the limit this page does not cross: a published size is a measurement, never a fit. A head circumference is comparable between brands; the internal shape of a shell is not published by most makers and is what decides whether a helmet is bearable after an hour. This page reports the measurement and says where the measurement stops being enough, and it recommends no size to anybody.
Questions riders send in about this
Do earplugs solve it?
They reduce what reaches the ear, and many riders use them on long journeys. Local rules on their use differ, and that is a question for the rules where you ride.
Is a more expensive helmet quieter?
Often, because construction and seals improve — but the screen and the fit can undo it entirely. It is not a property you can buy from a specification sheet.
Last reviewed 18 September 2026