I recently bought my first geared bike (Yeti sb66) in 10 years. This thing has miles of chain and I had forgotten how noisy a multi-geared drive-train can be. The bike is a 3x10 with a mix of SRAM x7 and x9 bits. I think I want to drop the big ring off the bike; I'm not using it where I ride and I'd like to take out a lot of the slack in the drive-train. The rule of thumb in the past was to take your chain around your biggest rings in the front and back without going through the derailleur, then add a link for correct chain sizing. Does that still hold true? Am I going to need to drop down to a medium cage rear derailleur to work with the 2x10 setup or will the long cage work well enough? Any chainline issues I should consider? I'd think that it's current line should be good; it seems to run fine all over the cassette from the middle ring and I know better than to cross it from small ring to small cogs.