It's a 4 speed retrodirect drive, never seen one with a double chainring like that. The 2nd tensioner on the chainstay is for picking up the slack when in the smaller ring. Oh and I guess you can only shift the front while pedaling forward. Not sure a front derailleur would work when pedaling in reverse.
Front derailleur could work pedaling reverse honestly, it's just a bit of metal that shoves the chain to either side. I think the biggest obstacle would be that the teeth aren't designed that way around
It's a 4 speed retrodirect drive, never seen one with a double chainring like that. The 2nd tensioner on the chainstay is for picking up the slack when in the smaller ring. Oh and I guess you can only shift the front while pedaling forward. Not sure a front derailleur would work when pedaling in reverse.
I don't understand anything of what you said
this should help clear things up
https://hexbear.net/pictrs/image/7bed5750-3aeb-4b43-b43b-8a3563150abd.png
Front derailleur could work pedaling reverse honestly, it's just a bit of metal that shoves the chain to either side. I think the biggest obstacle would be that the teeth aren't designed that way around