IGNORE THIS POST -- I've already started a discussion on this. I'll revive the thread. SORRY

I have a threaded non drive side 26" wheel on a Trek T900 and I'm considering a cable pull disc...

Basically: What do I need to know?

I have road Brifters that I'm about to install and the frame is set up for V-Brakes (Or cantis, but I don't like them too much) but has the mounts for disc (See pics)

I gather I need a large disc for tandem use? What diameter are we talking?

Standard cable outers?

I assume there are a variety of screw-on plates to mount the disc to the wheel?

Any info or useful link will be much appreciated

Thanks folks