Old 06-08-21 | 07:20 AM
  #3  
HillRider
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Joined: Aug 2005
Posts: 33,657
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From: Pittsburgh, PA

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

The 11T small rear cog spec for those derailleurs is a minimum, not a limit. Any of those will work fine with a 12T or even a 13T smallest cog.

Also, the maximum front tooth difference isn't a hard limit. I have two bikes with 105 FC-5703 triple cranks and FD-5703 front derailleurs. The derailleurs are rated for 20T maximum (50/39/30) but I have replaced the 30T granny chainring with a 26T giving me a tooth difference of 24T and they shift just fine.
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