New Replacement Derailleur Hanger Derailleur Hanger 321 All Wheels Manufacturing replacement derailleur hangers are produced in Colorado to exacting tolerances. CNC machined 6061 aluminum Black anodized finish Attaches to frame with (2) M3x12 Flat Head Screws Fasteners/Bolts Are Included Replaces Trek Part #W524188 Manufacturer Part Number: DROPOUT-321 811079024572 Fits: Boone (standard mount derailleur) - 2018-2019 Domane ALR Disc (standard mount derailleur) - 2018-2019 Domane SL Disc Thru Axle (standard mount derailleur) - 2017-2019 Domane SLR Disc (standard mount derailleur) - 2017-2019 Emonda ALR Disc (standard mount derailleur) - 2019 Emonda SL Disc (standard mount derailleur) - 2018-2019 Emonda SLR Disc (standard mount derailleur) - 2018-2019 Madone SL Disc (standard mount derailleur) - 2019 Madone SLR Disc (standard mount derailleur) - 2019 Compatible with Shimano, Campagnolo and SRAM Rear Derailleurs Made in the USA **Assure that your hanger looks like the photo in this listing prior to purchase.** NOTE: Many derailleur hanger-destroying accidents are caused by improper adjustment of the derailleur PRIOR TO THE ACCIDENT. Do not simply install a new derailleur hanger and forget to properly adjust the derailleur.
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