if you have a multi geared bike, and you find a gear combination which is the perfect, all around, never need to change out of it gear, then just dont shift, it will be like a single. these are the only single speed bike ive ever owned
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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