There have been several threads on this in the past.. try doing a search
Here is a commercial version http://2x2cycles.com/products/bicycle-rack/
and a thread http://advrider.com/forums/showthrea...hlight=bicycle
There are more threads out there.
edit: another thread http://advrider.com/forums/showthrea...hlight=bicycle
review of the above linked 2x2 mount.
We are enmeshed in the cancerous discipline of "security." And in the worship of security we fling our lives beneath the wheels of routine - and before we know it our lives are gone.