if you need a longer seatpost than the standard length, then the frame is probably too small for you to start. Ebay is your one stop spot for used components, lots of good stuff.
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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