Shimano Tiagra FC4550 Compact Cranksets offer greatly enhanced feel and sleek design backed by new levels of performance. Requires 9speedcompatible chain Hollowtech II right arm includes integrated 24mm OD BB spindle Item Specifications Color Silver Spindle Interface Type Hollowtech II Pedal Spindle 916 Bolt Pattern 5Bolt Chainring BCD 110mm Rings 3450 CrankFD Type Road Compact Crank Intended
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