Zorro, how do you plan to mount a nine speed cassette to an old Brampton (Sturmey Archer copy) IGA? Your 81 speed intrigues me! As some might remember I have an 81 speed Cannondale which is built around a SRAM Dual Drive IGH. Also during the past month I've turned my Dahon Folder into a 54 speed travel bike with another Dual Drive build.
Stop teasing and start revealing!
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Bob
Enjoying the GA coast all year long!
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www.freewheelspa.com