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1 inch....

android said:
You should. It needs to be 2 inches longer and will pull your rear derailleur too tight if you don't add the extra links.
Actually, the length may be OK if it was set properly, using the little ring and smallest cog, to get the maximum capacity from the RD. If was set to the minimum length in the big/big combo (the wrong way) then the chain will need to be 1 inch longer. A 4T change only requires a 1-inch longer chain, not two, because the chain only wraps half way around the ring.
 

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small x small

C-40 said:
Actually, the length may be OK if it was set properly, using the little ring and smallest cog, to get the maximum capacity from the RD. If was set to the minimum length in the big/big combo (the wrong way) then the chain will need to be 1 inch longer. A 4T change only requires a 1-inch longer chain, not two, because the chain only wraps half way around the ring.
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Agree, I always set chain length by the longest that works in the small x small combo. Having too long a chain in that combo can be as bad or worse than too short in the big x big, plus it gives you maximum flexibility for changing other cogs/rings around.
 
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