Stoker stem advice needed
So, this question is regarding another tandem bike that is in my garage.
This bike actually does not belong to me - it belongs to my blind stoker.
I've been slowly improving it in various ways.
I want to put on narrower handlebars both front and rear. The ones on there now are both 44cm center to center, which is awfully wide. Figured out that if I take off the dummy brake lever hoods a 40cm rear bar will easily clear my butt/thighs.
Now the rear handlebar clamp is 25.4, which I hate. Seems that there is a poor selection of handlebars in that size. I'd like to find a nice 26.0 handlebar. The seatpost is 27.2. There is currently a shim between the seatpost and the stoker stem seatpost clamp.
What are my choices for going to a 26.0 bar clamp or even a 31.8 (which might be even better)? Or should I be convinced to stay with the 25.4 bar clamp for whatever reason?
The extension on stoker stem is currently just above 20cm.