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Derailleur Hanger fit for Trek Boone Crockett Domane Emonda Lexa Speed Concept 176 Black auspowers_batchone Versatile And Multi-Purpose: We madeDerailleur Hanger fit for Trek Boone Crockett Domane Emonda Lexa Speed Concept 176 Black Read more : Derailleur hanger is a metal extension of the rear dropout through which a rear derailleur is mounted. If the rear derailleur is damaged, mostly likely the derailleur hanger could be damaged as well and has to be replaced. It's also recommended to carry a spare derailleur hanger when riding a mountain bike. Below is a reference of compatibility list.