Compatible 11 speed freehubs

trek.1400
trek.1400 Posts: 2
edited June 2014 in Workshop
Want to upgrade my shimano rs80 c24 rear wheel (previously been 9 speed) to accept an 11 speed cassette. Is it as simple as fitting an 11 speed freehub body? Been looking online but can't find one, or I was thinking of buying a cheap shimano 11 speed rear wheel, take off the freehub body and put it on my rs80? Would it screw on to the hub? Cheers.