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The Shimano Tiagra 4700 double front derailleur has been updated in terms of performance and looks to bring it inline with the more expensive derailleurs in the Shimano range. The derailleur gets an updated extended geometry with a longer lever arm for faster shifting which is a feature that is taken from the 11-speed derailleurs.Top Gear Teeth: 50-56TMaximum Capacity: 16T