Put some release oil such as PB Blaster on the derailleur bolt, then remount it to frame, and crank the bolt loose. No need for a new hanger. If you don’t like the color just spray paint that one.

The defy advanced one will definitely not work, they're different shapes. You can go silver, but with some penetrating oil I suspect you'll be able to get the old one off. When you install your new derailleur, put a little grease on the threads when installing it to prevent this from happening again.

Thank you! I will try that tonight.

I think I found one in black on eBay: https://www.ebay.com/...o1graCSRg05aFYjG6wfc

I will pull the trigger since it's only $13. Worst case scenario, I use the one I have and spray paint it. :)

Give us a picture of the bike.

I'm pretty good at finding hangers. At first glance it looks like you got the right one but without a picture of the bike to positively identify it, it'll be nothing more than a guess for me.

That LOOKS like Hanger 20:

https://wheelsmfg.com/...lleur-hanger-20.html

https://derailleurhanger.com/product/derailleur-hanger-20/


There are a number of different Defy hanger styles, so recommend trying to more precisely verify which Defy you have if possible.

I'd also recommend having the rear wheel clamped in the dropouts when you do this. Some hangers will bend forward if you really have to crank on the derailleur bolt...

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"I'm thinking of a number between 1 and 10, and I don't know why!"