I’m looking for a reason for tyre pressure loss, namely for two winter tyres “CONTINENTAL TS850 205/55R16 91H” mounted on original Mercedes-Benz aluminium rims. Already in the last winter season 2016/2017 there was regular air loss on the front axle mounted wheels. I didn’t find the reason. Maybe bad people who play regularly on the wheels, but only at the front? Unprobably, but possible. Especially since the wheels in the winter season 2014/2015 and In the winter season 2015/2016, I was inconspicuous. A nasty screw made one of the summer tires go out today. As the seasonal wheel change is about to take place, I spontaneously wanted to mount the winter wheels with the said Conti tires, which hung on the garage wall. To my surprise, however, the two front wheels were pressureless, while the two rear wheels were in order. I briefly visited my local free workshop in the place. One wheel had 0.3 bar, the other wheel has It is possible that the wheels lose virtually all the pressure, although hanging on the wall and in accordance with the water bath examination in order, he would never have experienced. If it is possible that the air can escape to zero over several months, at the water level, the air can escape to zero. but doesn’t show anything? Or does anyone have a different explanation?