Since 2009, we’ve seen MotoGP riders instantly double in size after their mighty spills. That’s come thanks to Alpinestars’ active airbag technology, which deploys just before or during a crash. Now, similar technology has made its way to mountain biking in the form of the Tech-Air MX Airbag system and its new Downhill algorithm. It’s pretty interesting stuff too, so here’s what it’s all about.

It’s something that we’ve seen pop up (almost literally) on the top-level downhill circuit, so its development has been absolutely no secret, but the Tech-Air MX Airbag system is here, paving the way for active protection in mountain biking. But importantly, as this is a technology originally used for motorsports, Alpinestars has developed a specific MTB Downhill algorithm, which is downloadable through the Tech Air app, and as you can expect, it’s shaped for the demands of modern mountain biking.

2026 alpinestars tech-air mx explode
2026 alpinestars tech-air mx explode (Image Credit: Alpinestars)

That algorithm is designed to track the rider’s movements throughout a run and, specifically, loss-of-control events. Then, as the system detects a crash through abnormal movement, it’ll deploy its airbag in around 40 milliseconds to provide airbag coverage to the chest, back, and shoulders. Alpinestars says that the system is four times as protective as a ‘passive’ impact protector, such as a D3O insert, or similar. The system then automatically deflates.

A really handy feature is that this isn’t a single-use product. The airbag can be re-packed after a deployment. The gas cartridge used to inflate the bag is also replaceable. That canister itself offers six inflations before requiring a replacement, says Alpinestars.

2026 alpinestars tech-air mx back
2026 alpinestars tech-air mx back (Image Credit: Alpinestars)

I’m told that the system weighs a total of 1.6kg and that it’s battery-powered. That battery offers up to 30 hours of riding time, says the brand, with a recharge time of four hours. Apparently, a one-hour charge can offer around eight hours of riding time. The canister is accessed via a cover that sits on the back of the protector.

While the active protection facet of the Tech-Air MX Airbag system is very cool, it’s also packed with passive protectors. As such, the vest offers Level 1 chest and back protection via Alpinestars’ Nucleon Plasma, honeycomb, and Polyhadron Cell technology. These all balance that protection with breathability while keeping overall weight to a minimum.

As you can imagine, the Tech-Air MX system isn’t cheap, coming with an asking price of £569.99. Replacement gas canisters will set you back £99.99.