Here's the group, sold in europe as "trekking". Just a step down from XT. Good robust group slightly heavier than XT I believe.
http://www.shimano-nordic.com/publis.../deore_lx.html
all the components have 66x designation
edit: this is from the shimano swedish site, but most of the info is in english.
framnav = front hub
baknav = rear hub