In cars the airbag has been standard for decades, on motorcycles it is now catching on. A motorcycle airbag vest inflates within milliseconds in a crash and protects your chest, back, neck and spine. But which system is better, the tethered vest or the electronic one? Here are the differences, the results of the ADAC test and some honest buying advice.
Two systems: tether or sensors
| Mechanical (tether) | Electronic (sensors) | |
|---|---|---|
| Triggering | A cord connects vest and motorcycle. If you separate from the bike, it pulls the trigger. | Sensors and an algorithm detect a crash or impact and trigger the airbag. |
| Reaction | only once you move away from the bike | can trigger on impact, even while you're still seated |
| After deployment | replace the CO2 cartridge, often possible yourself | usually a service by the manufacturer or a new cartridge, depending on the model |
| Technology | simple, no battery | battery must be charged, sometimes software and subscription |
| Price | cheaper | considerably more expensive |
The tether is robust and simple. Its drawback: it only reacts when your body separates from the bike. In a head-on collision with a car that can be too late. Electronic systems detect the crash earlier but need a charged battery and cost more. Newer mechanical vests also react within milliseconds, so the gap has narrowed.
What the ADAC test showed
The German automobile club ADAC crash-tested airbag jackets and vests from Alpinestars, Dainese and Held. All tested models were rated "good" and gave additional protection to the chest and back in crashes up to about 50 km/h. From first contact to full inflation took about 80 milliseconds. The differences lay mainly in the size of the protected area and how versatile the system is to wear.
Standards: what to look out for
For mechanically triggered airbags there is the EN 1621-4 standard. Among other things it tests the triggering time and the protective effect. Electronic systems are also certified as protective equipment, but using their own test procedures. Either way, look for CE marking and check which parts of the body the airbag covers: only back and chest, or also neck, shoulders and hips.
Vest over the jacket or integrated?
- Over-vest: worn over your normal jacket. Practical because you can combine it with several jackets. The jacket needs to leave some room for the airbag to inflate.
- Under-vest: goes under a matching, slightly looser jacket. Discreet, but not compatible with every jacket.
- Integrated jacket: airbag built into the jacket. The most comfortable, but you're tied to that jacket.
Who should consider an airbag vest?
For anyone who rides regularly, an airbag is a sensible addition to a back protector and good clothing. Frequent riders, commuters in heavy traffic and touring riders benefit most. If you only ride to the ice cream parlour once a year, you might invest in a good helmet and jacket first. An airbag vest doesn't replace a back protector in every case. Check the manufacturer's information on whether the vest includes a back protector or needs one in addition.
In everyday use: what you should know
- Unclip the tether before getting off, otherwise the vest deploys as you dismount.
- Charge electronic vests before every tour and check their status.
- After deployment, have the vest checked or replace the cartridge as instructed.
- When flying, ask the airline about the rules for CO2 cartridges and batteries.
Which protection classes apply to the rest of your clothing is explained in CE levels and abrasion resistance.
Summary
An airbag vest offers measurably more protection for the upper body and spine. Electronic systems react earlier but are more expensive and need a battery and care. Tethered vests are simple and cheaper. With both, the vest must fit your jacket and always be ready to use.
Frequently asked questions
How fast does an airbag vest inflate?
In the ADAC test it took about 80 milliseconds from first contact to full inflation.
Is an electronic airbag vest better than a tethered one?
It can deploy earlier because it doesn't wait for you to separate from the bike. It is more expensive, though, and needs a charged battery. Both systems offer much more protection than no vest.
Can I keep using an airbag vest after it has deployed?
With mechanical vests you usually just replace the CO2 cartridge. Electronic systems may need a service depending on the model. After a real crash, the manufacturer should inspect the vest.
Which standard applies to motorcycle airbags?
EN 1621-4 applies to mechanically triggered airbags. Electronic systems are certified as protective equipment using their own test procedures.
Sources
- How well do airbag jackets protect motorcyclists? (ADAC, German)
- Airbag jackets for motorcyclists in the ADAC test (ADAC press, German)
- Electronic airbag vests in the crash test (Motorrad Online, German)
- Airbags you can combine with your jacket (Motorrad Online, German)
Last checked: September 2026.