"Direct-Mount Derailleurs: Latest Developments from TRP, Campagnolo, and Shimano"
TEKTRO, the parent company of TRP, has published a patent detailing a new rear derailleur design that is a Direct-Mount Derailleur, mounting onto the dropout co-axially with the hub axle. The patent aims to improve the stability of the bicycle rear derailleur to resist an impact or a shock. The design has similarities with SRAM's T-Type Eagle Derailleur and Shimano's Patented Direct-Mount Derailleur. TRP's Direct-Mount Derailleur has a single arm that sits outboard of the dropout and can be removed from the frame without removing the rear axle. The patent document makes no reference as to whether or not this derailleur would be electronically or mechanically actuated.