So, my wheels are standing in the basement (2 horizontally on each other, the other 2 next to each other). The heater type was there and he had to do something on the ceiling (drill, supposedly) and is simply on my wheels on it and his work. I wasn’t there, of course, but only my mother, who didn’t know that you shouldn’t do that. Now my question… how tight are the things? Can they be damaged so easily when an adult man is on it? There are 21″ alu rims and de talking summer tires on it. I have made a short visual inspection, everything seems to be fine, but I will not know until the wheel change in May.