Old 05-16-06, 10:33 AM
  #2  
HillRider
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Location: Pittsburgh, PA
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Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

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There is no reason you can't remove the 12T and go directly from 11 to 13 if you don't mind dispensing with the 12T altogether. You will need a new lockring. An 11T top cog requires a specific smaller diameter lockring.
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