Oh no no.

You don't need any shifter. You just use 3/32 chain and tension the chain. Just read the link here.

http://www.surlybikes.com/new/dinlgecog_pop.html

I never tried it. I am still on 46-17. I now plan out my routes so I am close to coffee shop when I run out of gas.

T

P.S. Tokyo-Yokohama? Oh I really need to do that. There is a frame I really need to see.