Wheels Manufacturing hangers are stiffer than almost any OEM hanger, which improves durability and shifting performance.For short chainstay (Includes DO bolt 26-15634)For long chainstay see Derailleur Hanger 580Custom M12 Bolt (DROPOUT-FAST-05)Thru-Axle thread M12x1.0Fits Santa Cruz models: Megatower V1 (2019-2020), Tallboy V4 Carbon (2019-2020), V10.7 (2019-2020)Replacement for Santa Cruz parts: 23-20089, 04-20894OEM hangers are only produced by a handful of manufacturers, mostly in Taiwan and China. As a result, you will see many bikes with exactly the same hanger. Bicycle manufacturers may make mid year changes. Please use the hanger photos to select the proper hanger for your application.CNC machined 6061 aluminumMade in the USAItem SpecificationsFits BrandSanta Cruz Wheels Manufacturing Hangers Requiring 1 Fastener Derailleur Hangers UPC: 810124710132