Originally Posted by
caloso
But as to your question, you'd need a new wheelset, new fork, new frame, new levers. Oh and of course new brakes. Even if you could adapt your existing bike (and I don't think you could) it would be cost prohibitive.
Wheelset: depends. See below.
Fork: yes.
Frame: depends. You could keep a rim brake for the less powerful rear brake. This would require a custom wheelset to get a rim brake capable rear that matches your front, or take a standard front wheel (like your current one) and rebuild it with new spokes and disc brake hub.
Levers: no. Plenty of cable operated disc brake calipers available allowing use of a full 'rim brake' groupset.
My first disc brake road bike was built up just like the above. My second used an actual disc brake frame but maintained cable operated brakes so that I could use a standard Chorus group.