[MENTION=45916]Bklyn[/MENTION] - Hey, are you sure you've got the right elevation map?

According to this, you're looking at about 3k ft for the 100 miler.

http://theprouty.org/wp-content/uplo...ofiles.sw_.pdf

Gearing wise, I'd go 18T and go with a 19 or 20T Freewheel on the flop side.