I've used both the Soma cage and the Red Clover tripleizer on a NR drivetrain. 13-24 six block and 52/42/28 up front. Worked as well as any NR drivetrain.....
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)