Is your Tiagra crank a compact (a double) or is it a triple? What range of gears will you be running? That can affect the cage length needed on the rear derailleur. Your setup guy should be able to...
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Is your Tiagra crank a compact (a double) or is it a triple? What range of gears will you be running? That can affect the cage length needed on the rear derailleur. Your setup guy should be able to...