Shimano's Patent Suggests Direct-Mount Derailleur Design.

Shimano has filed a patent application for an integrated rear derailleur that fits directly onto the rear dropout, removing the need for a derailleur hanger and held in place by the thru-axle. The design is similar to SRAM's T-Type Eagle Transmission, which combines a direct-mount rear derailleur with the Universal Derailleur Hanger standard. Shimano's patent includes an "angular position structure" for initial setup and suggests compatibility with different cassette sizes. This patent application suggests Shimano may add a true direct-mount option to its mountain bike range.