What does a second derailleur Hanger do?

Nvreloader

Well-Known Member
Region
USA
I am attempting to find out why the Shimano Alivio long cage derailleur would have a second hanger (1" long c/c) permanently attached to the OEM 386 hanger, for use with a 34T cassette?
The only thing I can come up with is too drop the derailleur down for longer length/adjustment?
This doesn't make sense, as the Wart Hog with a 34T (Sram) cassette use's a med length cage and both are 9 spd's and works perfectly.

Your thoughts and suggestions.......
Tia,
 
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