Tyres which can inflate themselves have often seemed like a sci-fi conception of a would-be gain in WorldTour riding, but the technology has moved one step closer to breaking into the WorldTour peloton at the 2024 Gravel World Championships.
Marianne Vos (Netherlands) showcased Gravaa’s self-inflating tyre technology ahead of the Gravel World Championships following an absence of the system since the 2023 edition of Paris-Roubaix.
The Gravaa system uses tiny compressors which live within the bike hubs to inflate the pressure of the tyre while on solid terrain, before reducing pressure to accommodate rougher terrain where lower pressure could optimise rolling resistance.
Gertjan van Ginderen, owner of Gravaa, explained that the system has been developed considerably since its initial release in 2022. “So we improved the electronics a lot, I must say,” he told Cyclingnews. “So there’s a PCB inside each hub, and this is very vulnerable for moisture dirt, so we’ve actually made a change inside the technology to have it completely potted.
“So it’s completely potted the electronics in the epoxy. We’ve changed the antenna, we’ve changed the disc brakes, including the interface of the disc brakes, also to be compatible with other spoke configurations.”
Gravaa’s control system is located in the bar end (Image credit: Future / Peter Stuart)
“This basically is a very small compressor clutch mechanism and electronic printed circuit board, and the hubs talk with each other. So the front hub is the master, while the rear up is a slave. And to the front up, you can connect either your smartphone or your bicycle computer, as long as it and plus or Bluetooth compatible.”
The technology stunned the world of cycling tech obsessives when it first made its appearance in 2022, with the potential improvements of rolling resistance offering a considerable advantage against competition in mixed terrains.
While initially intriguing, none of the riders using the Gravaa system for Visma in 2023 saw success at that year’s edition and the hubs were not used the following year.
However, with the technical updates, and Gravaa’s broader business development, Van Ginderen is confident the technology will now become a more permanent fixture of Visma-Lease a Bike’s bike setup at the Classics.
The Gravaa system has been honed since its last use in 2023 (Image credit: Future)
Marianne Vos explained that she had been training on the bike ahead of the race. “I’ve been on the Cervelo gravel bike already two years ago, but now this setup on the new bike I only had since last week. We have done some recons on this bike, at least the bike is ready,” she said with a laugh.
Vos enters the women’s elite race as a favourite , and so her use of the technology is a big vouch in the team’s confidence in using it.
“I have to do a good race, stay out of trouble. It’s difficult to predict how things will unfold, how I will be. I feel good. We want to try and be with some Dutchies in the final,” she said.
Dutch teammate Femke de Vries is also using the system, and Belgian rider Tiesj Benoot will use it in tomorrow’s men’s elite race.
