Hey guys I have a 2012 flhx....id like to put a 21" wheel on it...would a 21" off a victory fit it? I basically was given it for free...its single rotor but I can probably convert it no?

 

Anything is possible with enough work and money.

 

This came off a 07 victory jackpot...

 

That's not a typical fitment question so I doubt someone here has done the same thing, but it's possible.
It shouldn't be too complicated. You may have to change the bearings if the axle is a different diameter and get the proper spacers made if they can't be purchased.