Wheels Manufacturing Niner Replacement Derailleur Hanger / Drop Out - 308Wheels Manufacturing Niner Replacement Derailleur Hanger Drop Out 308 All Wheels Manufacturing replacement derailleur hangers are produced at their Colorado shop to exacting tolerances. Genuine Wheels Manufacturing replacement derailleur hanger MPN: DROPOUT 308 Replaces Niner Part #28 013 13 00 20 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