Where to find derailleur hanger for generic bikes

[PoorCyclist]

I have a generic / house brand bike, I want to find derailleur hanger for it.
Not sure where to start.. wheels mfg catalog?
found this site:
http://www.derailleurhanger.com

eyeball match is the best way?

The store I bought it from is not alot of help.

[SUCycling88]

Try and match it to one on wheels mfg's website, or qbp. It should match something thats currently on the market.

[dwb]

Contact wheels mfg. http://wheelsmfg.com/derailleur-hanger-tech-help

I called and emailed pictures to them. They were really helpful.

[kode54]

i had great results from derailleurhanger.com

i eyeballed it based on the bike manufacturer. the fit was perfect.