I'm using a Schwinn Meridian as my cargo bike for groceries. However it is singlespeed, I find the gearing on it is too low for most things, yet on hills it seems approximately right. I think with gears I could significantly increase my shopping range by not having to pedal like a monkey.
The main problem is the weird double chain setup on the bike. I'm not sure what the best way to tame it is.
So for gears I have a few options(i think)
It seems that due to the weird tubing on the front doing another other than an eccentric front duralleur would be trouble. I'd also lose the nice chain cover, i'd like to avoid doing that. However if I were to drop the chain cover and swap crankset + add excentric bb, do you think it would work ok? Would chainline be an issue? Have to mount a tensioner somehow then too.
b) tomicog + disc hub + cassette. This seems unlikely as the rear is spaced at 130mm, and it's next to impossible to find a disc hub in that size
c) Sturmey Archer 8sp 6bolt hub to get speeds..and a tomicog instead of the disc brake to drive the second chain. Shimano IGH stuff won't do since it's centerlock so cog would unscrew itself over time.
Any opinions on my options? Are there other ways to add gears that I missed?