Joined: Mar 2014
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Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
You want to use a 9 speed chain with a 9 speed derailleur and cassette. 11 speed is excellent for 11 speed stuff. The only time you are going to use a chain for more than one speed is generally with 8 speed going down to 5,6, and 7 but sometimes 5 speed might not always be as good with some of the 8 speed stuff.
Not sure what performance is to be had with the incorrect chain? Also not sure what weight savings you are really getting on a metal chain? If you are looking to save weight go with a single speed and a belt or lose weight elsewhere.