Trouble in paradise

Arrrg, what has happened here ??.
Where do i put the rear cantiliever brakes.
There just isnt any studs.
A closer inspection reveals, that i need disc brakes for the rear...
Oh no, that means that the rear wheel has to go as well.

Oh well onto qxl / dba to see whats there.
The plan now, get a 160 mm rear disc, and replace the rear hub.. No biggi