Clunkers. The early MTB pioneers were racing them downhill in SoCal during the mid 70s. The bikes had coaster brakes which failed often with that kind if usage. Then they invented the MTB and everything changed.
Electra still makes them but they're quite heavy and too expensive. One could buy a much more useful urban IGH or 1x derailleur bike for the same amount. Like a Kona Dew.
