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I show how to upgrade an old mountain bike from V-brakes to disc brakes. I replace the wheels, install rotors, calipers, new cables/housings, and adjust everything. The disc brakes I used are Avid BB5’s. I used 160mm rotors. They are mechanical disc brakes, so are cable actuated. The Avid CPS mounting brackets I used were 0mm IS for the front, and a 20mm IS for the rear.