While trying to find some info on the Wonder tandem, (it’s easier to research on the net in winter than brave a cold workshop), I came across this great forum, all in French, related to this manufacturer from St Etienne.
Some fantastic advertising posters.
A few pictures of tandems, but Ravat models, not Wonder. This one looks pretty similar to mine. Similar derailleur, “gents” saddle at the front, wider “ladies” saddle at the back, same tool pouch, mudguards, but it has a split down tube and the top tube carries through to the rear seat tube.
From the look of these pedals, mine aren’t original.
I imagine myself pretty much as the chap in the photo below, casually pointing out a route on a map to his female companion.
I was curious why the chain goes all the way from the front chain ring to the freewheel on my tandem. Typically I have seen one shorter chain between chain rings, and another between the rear ring and the freewheel.
The advert above says that this is how Ravat tandems were deliberately designed, along with a short rear wheelbase and thin lateral tubes, which “improves stability, rigidity and performance”. That’s a bit of a vague claim, and I don’t see how the chain length would help with that, but when I ride it I guess I’ll decide for myself!
Once I start on the restoration in earnest, I’ll be sure to reach out to the forum members. Looks like the only place to go!