The derailleur hanger for frames are designed to bend or break, in order to avoid damage to the frame that would be more expensive. Therefore these dropouts are made of 6061 aluminum.Suitable for 4Ever, Airborne, Argon 18, Bergamont, BH, Blue, BMC, Boardman, Bulls, Canyon, Carrera, Carver, Cinelli, Corratec, Crescent, DBS, De Rosa, Decathlon, Dedacciai, Definitive, DeVinci, Diamondback, Ellsworth, Fat Bike, Flanders, Focus, Fondriest, Fuji, Ghost, Gios, Gitane, Go Sport, GT, Haibike, Hercules, Isaac, Jan Janssen, Kestrel, KHS, Kildemoes, Koga, Koga Miyata, Kuota, Leopard, Litespeed, Marin, Masi, Massi, MBK, Motobecane, Müsing, Planet X, Principia, Quintana Roo, Raleigh, Redline, Ridley, Rocky Mountain, Salsa, Schwinn, Scrapper, Sinus, Staiger, Steppenwolf, Stevens, Storck, Titus, Viner, Viper, Wilier, Winora bike brands