Dogtrousers
Kilometre nibbler
... and I'm sure it doesn't need pointing out to the learned assembly on this thread, but such a bike has been used to complete Paris-Brest-Paris in under 90hours (by a less-than-youthful amateur)
Just been reading about it. Not only was it retro direct but it was actually an original 1920 machine. Fascinating.
https://chasingmailboxes.com/2013/12/30/pbp-memories-drew-buck-and-his-1900-peugeot/
Not something I could do on any bike, regardless of the number of gears.