shifting is easy. dont worry about numbers at all. ride where it feels right. there are only 2 gears your not supposed to use and thats 1/8 and 2/1 (double crank 3/1 on tripple), you can look down and see the crosschaining.
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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