There are calculators for this type of thing, but without looking it up I don't think you have to worry. There's almost always a little flexibility both ways on chain length unless whoever set it up before cut it absolutely as short as possible. I switch my setup between 11-28 and 11-32 pretty often and don't bother with the chain at all.

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Benjamin Deal - Professional - Instagram - TriRig - Lodi Cyclery
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