What’s right?

Hello forum, today was abcampen, i.e. my caravan should be moved to the winter camp. It is an old (BJ. 1987) from Wilk, which is moved in spring to the Elbe and in autumn to the winter camp and stands the rest of the time. Anyway today at least 2 tires were flat, could not be pumped again and I need now as cheap replacement as possible. In fact, these tires do not even have to have profile, but only hold the air. What I am looking for is So actually scrap for which I’m not willing to spend a lot. Considering the fact that mounting new or used tires alone costs at least 10,- per bike, I think it’s cheaper to buy any complete bikes at ebay Of course not infinitely far away, but so that I can pick them up. My first impression at Ebay has also been confirmed. The offer is great – people are happy when they get rid of the stuff. Which makes the whole unevenly complicated Rte is what the wheels also have to do : fit ! … and there’s my problem. I took pictures of the flat tires earlier. There’s 165 R13 on top. It’s also 4 wheel bolts. That’s pretty nice, but certainly not everything. Should 145 or 185er not fit or 14 inch? I don’t have to use it to the TÜV. I’ve already heard about press-in depth, but I didn’t quite understand how much this will affect and where to read it. On the rim itself could be Can someone tell me how I find out if a bike fits (and actually only if it fits). The TÜV is not allowed to talk in here? thanks for tips and best greeting, heinetz