Wheels Manufacturing CO-OP Replacement Derailleur Hanger / Drop Out - 429Wheels Manufacturing CO OP Replacement Derailleur Hanger Drop Out 429 All Wheels Manufacturing replacement derailleur hangers are produced at their Colorado shop to exacting tolerances. Genuine Wheels Manufacturing replacement derailleur hanger MPN: DROPOUT 429 Fits CO OP 2020: ADV 2. 2 May fit other brands and models, however, we advise you to assess the product image prior to purchasing to ensure that the item is the correct fit for your bike.