I was at a bike show a few years back , when this pulled up , Swallow Sidecar bolted to a BSA !
That photo reminds me, of one of the more puzzling convos I had…
The first bike I had with a front disc brake was a 650 Yamaha (@David_Ahlers remembers them, I bet!): a friend of mine looked at that and asked, in all seriousness, “Doesn’t that cause the bike to pull to one side, under braking?”
I was… amazed.