I have mounted my Niner Jet9 RDO 2012 with the gear cabling outside the main frame and inside chainstay. The outer cable follows the brake hose on the down tube, goes between the BB and the bottom CVA and continues in a soft curve directly into the chain stay, all the way to the rear derailler. I haven't used any ferrules and there's absolutely no signs of damage on either outer cable or chainstay. Shifters and rear der. is XO 9-speed. The shifting is flawless, the best I've ever had.
FWIW: I have a riding buddy who owns a Jet9 RDO 2013. He just did the same trick with XX 10 speed shifters. It works perfectly.
URL: How to cable rear derailler on a Niner Jet9 with 1 outer cable
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