I'm an older guy setting up a Surly Troll for a one bike everything bike and I've got some gearing questions for the knowledgeable.

I'll probably keep the Shimano HG-61, 12-14-16-18-21-24-28-32-36t that came with the complete build bike.

I live on an extinct volcano in Costa Rica so know a granny will come in very handy, just don't really know what to couple it with, any suggestions? I've got a 22T granny as a low (for loaded touring in the mountains).

My big questions are what would you guys run on the two larger rings (they come with 36t and 48t in the complete bike build) and why? Maybe reduce the 36t to a 34t or 32t or something to turn it into a more everything gear as I wouldn't be using the granny so much andy more? Maybe even reduce the 48t to a smaller gear also?

Thanks,
Mark