Originally Posted by
unterhausen
Putting discs on a road bike is a pain. They aren't made with space for a disc. If you really want this, it's probably best to get new bikes.
If you do go with discs you will need new wheels and the standard now is pretty much 100mm axle in the front and 142 mm in the rear. If I were to do this I would make a new fork for the wider axle and legs made for disc brakes. In the rear you should be able to get away with a set of the Paragon drop outs for disc brakes.
https://www.paragonmachineworks.com/...12-mm-hub.html