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Join Date: Dec 2004
Location: Quahog, RI
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Bikes: Giant TCR Comps, Cdale R5000, Klein Q-Pro, Litespeed Siena, Piasano 105, Redline Conquest Pro, Voodoo Bizango, Fuji Aloha
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Switching from 12-25 to 12-27 shouldn't require a longer chain assuming it was sized properly to begin with. I regularly swap between 21s, 23s, 25s, and even a 28 for mountain climbs with no problem. The RD takes up any extra slack.