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@PhilPub
I'm trying to gauge the largest cog/smallest gear I can fit to my girlfriend's bike. Current set-up is a stock Giant Defy road bike with Claris group set incl. medium-cage rear mech, compact double 50/34 with 11-30 cassette. I believe 32 is stated max but can I get away with 34? (The bike originally came with 11-32 but bike mechanic in his infinite wisdom assumed 11-30 "would do" as an upgrade!)