that seems like it will work, although it looks a little goofy. good idea to save some cash on proper shifters. sorry I have no experience w/topeaka bar extenders.
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2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
2000 litespeed Unicoi Ti, XTR,XT, Campy crank, time atac, carbon forks