Originally Posted by
jadocs
What size is your cassette? Is your largest cog bigger than a 30? I’m trying to figure out why you need that hanger extension.
The hanger extension in the picture looks like a direct mount adapter, which Shimano derailleurs also have. It's required if your bike doesn't have a direct mount hanger, which most road bikes don't.
I think I can see it in
this picture from Campagnolo's website.