Wear earplugs on every ride longer than about twenty minutes at highway speed, and wear them under a good helmet rather than instead of one. The reason is not that motorcycles are loud — most of the damage is wind, not engine — and the reason is not volume alone but the number of hours you spend in it. The US National Institute on Deafness and Other Communication Disorders puts motorcycles and dirt bikes at 80–110 dBA and states that long or repeated exposure at or above 85 dBA can cause hearing loss. A full day's touring sits inside that range for most of its length.
Where the noise actually comes from
A helmet is not hearing protection, and treating it as such is the mistake that costs riders their high frequencies. Measurements of motorcycle helmet attenuation published in the International Journal of Occupational Safety and Ergonomics found essentially no protection against external noise below 250 Hz. Above 500 Hz, attenuation rises at roughly 8–9 dB per octave, reaching about 30 dB at 8 kHz. The record is indexed at Europe PMC.
That shape has two consequences. First, the low-frequency wind roar — the part that does the damage over hours — passes through the helmet essentially untouched. Second, the helmet damps the high frequencies that carry consonants, which is why speech and intercom audio sound muddy inside a lid even when the volume is adequate.
The dominant source is aerodynamic, and it is not where most riders assume. A flow survey by Kennedy, Adetifa, Carley, Holt and Walker, published in the Journal of the Acoustical Society of America in 2011, tested three candidate regions — the helmet wake, the surface boundary layer, and the cavity under the helmet at the chin bar. The wake and boundary layer contributed negligibly to at-ear sound. The cavity region around the chin bar was identified as the key noise source, and its contribution varied with both flow speed and helmet angle (Kennedy et al., JASA 130(3), 2011, pp. 1164–1172).
Helmet angle mattering is the actionable part. Riders who tuck their chin, or who run a screen that dumps turbulent air straight at the chin bar, are generating more of their own noise than they think. A neck roll or a chin curtain fitted to the helmet closes that cavity and does more than most people expect, and it costs a fraction of what a quieter helmet does.
Speed is the other lever, and it is not linear. Aerodynamic noise rises steeply with road speed, so the difference between cruising at 110 km/h and 130 km/h is far larger at the ear than the twenty on the speedometer suggests. Riders who drop their motorway cruising speed by a small margin on a long day usually report arriving less tired, and fatigue from noise is a real component of that.
What the exposure numbers mean for a touring day
Occupational limits are the only widely published, enforceable dose numbers, so they are a useful yardstick even though nobody is inspecting your commute. OSHA's Table G-16, in 29 CFR 1910.95, permits 90 dBA for 8 hours, 95 dBA for 4 hours, 100 dBA for 2 hours, 105 dBA for 1 hour and 115 dBA for a quarter hour or less. The hearing conservation programme's action level is an 8-hour time-weighted average of 85 dBA.
Set those against a helmet that measures somewhere in the 90s at motorway speed and the arithmetic gets uncomfortable fast. Four hours in the saddle is the whole daily allowance at 95 dBA — and a touring day is often eight.
The effect is measurable over a single ride. A study of 18 riders published in the Journal of Laryngology and Otology put them through a standard one-hour run at a steady 80 mph with audiometry before and immediately after. Significant temporary threshold shift was found at 0.25, 0.5, 1 and 2 kHz, with the greatest shift at 1 kHz and a mean loss of 10.3 dB. The record is on Europe PMC. One hour. The NIDCD notes that although this kind of temporary loss usually disappears within 16 to 48 hours, recent research suggests residual long-term damage may remain — its noise-induced hearing loss page covers the mechanism.
Choosing between the three types
| Type | How it behaves in a helmet | The catch | Best for |
|---|---|---|---|
| Disposable foam | Highest raw attenuation, cheapest, works if rolled and inserted properly | Cuts high frequencies hardest, so speech and sirens muffle; comfort varies; single use | Long motorway days, riders testing whether plugs help at all |
| Reusable flanged (filtered) | Flatter attenuation curve, so speech and traffic stay more intelligible | Less total reduction than good foam; flanges wear and harden; needs washing | Mixed riding, group riding, anyone using an intercom |
| Custom moulded | Best comfort over long hours, consistent seal, filters usually swappable | Highest cost, needs an impression appointment, fit changes over years | Daily riders and long-distance tourers |
| In-ear speaker plugs | Combines listening and attenuation in one | Encourages listening at the volume you would have used without plugs; wires snag on the helmet | Riders who already listen to audio for hours |
The compromise nobody advertises: foam plugs cut exactly the frequencies you use to hear approaching vehicles and to understand an intercom. Filtered plugs give up a few decibels of total protection to keep that information. For group riding with an intercom, filtered plugs are usually the better trade, and they pair better with the speaker problem described in how helmet speakers really perform.
Fitting them so they actually work
An improperly seated plug gives a fraction of its rated attenuation. This is the step riders get wrong.
- Roll foam plugs down thin between finger and thumb into a tight cylinder, not a cone. A cone will not go deep enough.
- Reach over your head with the opposite hand and pull the top of the ear up and back. This straightens the ear canal. Without it the plug stops at the first bend.
- Insert and hold for 20 to 30 seconds while the foam expands. Let go early and it backs out.
- Check the sound of your own voice. Properly seated plugs make your voice sound noticeably boomy and internal. If your voice sounds normal, the seal has failed.
- Put plugs in before the helmet, always. Pulling a helmet on over seated plugs will drag them loose; seat them, then hold the plug lightly while the helmet passes over.
- Re-check at the first fuel stop. Plugs migrate. On a long day, one re-seat halfway through is normal.
Two habits matter as much as the plugs. Wind noise scales sharply with speed, so a screen that puts clean air over your helmet instead of turbulent air at your chin is a genuine hearing intervention, not a comfort item. And if you are already running an intercom, turn the volume down after fitting plugs rather than leaving it where it was — the plugs cut the masking noise, so the same setting is now louder relative to the background.
When to stop guessing and see an audiologist
Get a hearing test if any of these apply, and do not wait for a season to end:
- Ringing or buzzing that persists into the next morning after a ride.
- Trouble following conversation in a busy pub or restaurant, but not in a quiet room.
- Consistently needing the television or intercom louder than the people you ride with.
- A sensation of fullness or muffling in one ear only, which is a different problem and needs medical attention rather than earplugs.
A baseline audiogram is cheap and gives you something to compare against in five years. Without one, you cannot tell genuine drift from imagination, and by the time a change is obvious in conversation it has usually been happening for a decade. If you also run music through a headset for hours, remember that the safe-listening rules for personal audio apply on top of the wind noise, not instead of it — the two exposures add.
None of this is a substitute for a properly fitting helmet. If yours lets in more noise than it should, that is often a fit problem rather than a shell problem, and the same checks belong in your pre-ride routine. For long trips where you will be in the helmet for eight hours a day, earplugs belong on the packing list alongside spare visors, and a riding system with proper audio ducking is worth more than raw speaker volume, because it lets you hear prompts without raising the baseline.
Frequently asked questions
Do earplugs make it dangerous to hear traffic?
Filtered plugs reduce level fairly evenly and leave sirens and horns audible, just quieter. Foam plugs cut high frequencies hardest, so they do reduce your ability to place a sound. Most riders find filtered plugs a better trade for urban and group riding.
Is a quiet helmet enough on its own?
No. Measured helmet attenuation is essentially zero below 250 Hz, which is where the wind roar lives. A quiet helmet reduces fatigue and improves intercom clarity, but it is not hearing protection.
Can I use earplugs and an intercom together?
Yes, and the combination usually improves intelligibility rather than harming it, because the plugs cut the masking wind noise more than they cut the speech. Turn the volume down after fitting, not up.
Are earplugs legal for riding?
Rules vary by country and by state or province, and a few jurisdictions restrict devices worn in both ears. Check the current wording with your own road authority before a trip abroad rather than relying on forum answers, which go stale quickly.
How often should reusable plugs be replaced?
When the flanges stiffen, discolour or stop springing back, which for daily riders is usually within a season. Hardened flanges will not seal, and a plug that does not seal is doing nothing.
