Tokyo is great because in the city you have pretty level ground, but head about an hour out of the city and you're in real honest-to-goodness mountains.

I have the stock setup on it at the moment, generic threadless stem and wide riser bars. I'm happy with this arrangement for the type of riding I'm using this bike for, but it does have some give to it. Basically I'm looking for a stiffer threadless stem, stiffer risers, or both if necessary.