Originally Posted by
JohnDThompson
Looks like a Trek bonded aluminum frame and dropout to me. If the dropout breaks, the whole dropout would need to be replaced. It could be difficult sourcing a replacement, and also difficult cleanly removing the damaged dropout and bonding the replacement. If only the hanger breaks, a functional replacement could be cobbled up from claw-type hangers or a generic replacement hanger.
If this heat-treated alloy hanger gets hit hard enough to break, it's taking the rest of the frame with it. If it's slightly tweaked, it shouldn't take too much finesse to tweak it back. Put a wheel in the dropouts and don't get carried away.