Originally Posted by
JISO
Looks like the closest alternative would be 50/26T front with a 16/19 dual freewheel cog and a 27T cog on the other side of the hub with a tensioner
This would be 83 gear inches top gear and 43 low gear on 16T with the ability to switch manually to 19T for 36 to 70 gear inches. 27T cog would be cumbersome to set up but results in a 25 to 50 inches two-speed range
I think at this point you have kind of pushed this a bit too far.
You started out with a triple crank and 2 cogs, but having to stop to move the chain was a problem.
Everyone ran around with suggestions and now you’re contemplating a double crank with 2 cogs that you have to stop to move the chain thus making a full 360 but with one less chainring on your Biopace crank. Why would you even do that?
I get the impression this light touring bike may only exist in your head.
But if I’m wrong, just run your original 3x2 as I doubt there is any other solution to meet your wants.
John