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@veLLo
Thanks! I requested registration to a US forum dedicated to my motorbike and intend to send them pictures of my problem to see if any of them experienced that before... Since I know from talking to you before that you know about motorbikes, I might as well show you the detail of it (I took pictures when I took the wheel off)
LHS picture shows the wheel and its center part where the shaft drive "spindle" connects. At the back of that, there are some silent blocks. There are normally 6 bolts to the surround, here 2 are missing. I did not notice when I lost the 1st one, I was probably going fast, it probably desintegrated, as I found rusty dust in there. The second one came off while I was going slow in town and I noticed immediately that somthing was going wrong, because this happened to me twice already in the last 5 years: I knew what to expect. I was wondering if the silent blocs had became harder and had shrunk with age (bike is from 1991!), creating some kind of play in there, puting the bolts under extra stress...? Saying that you cannot feel any play by hand. The wheel is also perfectly true.
RHS picture shows the hidden side of the shaft drive. You can see the most protruding bolts head have been like filed by the loose bolt being shaken in that tiny space...
Loic