It's annoying, the puncture on the trail. It makes a short but sharp "pffft" and the tire is flat, so you can't think about continuing. There are a few options afterwards: Push home, change the inner tube, fit a tubeless patch and much more. The French start-up company Choka has come up with a special solution in the event of a puncture. The so-called Air System is a compressed air tank that is permanently integrated into the frame. The reservoir is filled with a hand pump and is said to be sufficient for two to three tire fillings, and the air volume is also sufficient for the initial mounting of tubeless tires on the rim.

As part of a Kickstarter campaign, the Choka makers have offered two frames that rely on the integrated air reservoir. A hardtail frame designed for forks from 140 to 160 millimetres. And a gravel bike that is equipped with an eccentric bottom bracket and can be used with 700 or 650 mm tires. But there's a catch: the business idea of a frame with an air reservoir didn't take off on Kickstarter either. With 23 supporters, only just under 9,000 euros were raised, and the funding target of 100,000 euros definitely ran out of steam.