At first I don’t even know if I’m in the right forum for my concern. Anyway, a few days ago I bought a trailer Built. 1969 1.2t braked. Has still TÜV until 01/2013 The tires are a bit cracked and the profile also suffered a bit. I would like to mount in a few 15 or 16″ aluminium rims with corresponding tyres on them. At the moment 7.00 SR13 tyres from Michelin are on it. Unfortunately, I can’t start with the size at all. Do I have to find these tires again somewhere or can I have to register with other tires & rim combination without any other tires & rim combination? And, do trailers also get an oldtimer approval?