Clark W. Griswold
Join Date: Mar 2014
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Posts: 13,551
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
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Probably any Shimano compatible 9 speed would work. I think Alivio is the highest new stuff you will find.