Confession time: I said there was no chain involved in this teaser, but there is one. And a couple of shafts. And one absolutely enormous toothed belt.
The answer is that the engines of all four cars were also used in motorcycles. It’s a rarer peculiarity than might be expected, particularly as I applied a self-denying ordinance which excluded tricycles, sidecar haulers (even the Borgward-Goliath-Kröger), and one-offs. All four two-wheelers here were on public sale as complete, series-produced entities. Continue reading “Connect the dots #3: The Answer”