the only quasi-informative info i've found is http://bicyclingaustralia.com.au/2013/08/sram-type-2-overhaul?page=2 but since this isn't even 2yrs old, can i expect to need to rebuild/relube this every ~20 mos? is there any other preventative maint i can do, or a heavier/thicker lube that's compatible? i'm in CO, where it's very dry, and i never ride in any rain when it does come. anyone else have this? it's pretty annoying to have to wait 3revs+ for my shifting into smaller cog on an otherwise stellar drivetrain.