Ì have a pretty cheap mtb, I want to accumulate parts to eventually build a good bike. I would love the control and safety that discs offer. The frame i have does not fave mounts for a calliper per say, however it has 2 bolt holes which i think would normally be used for a carrier or maybe a mud gaurd. They're pretty standard on bottom end bikes. 2 holes located above the rear dropouts on each side of the bike. Can i get adaptors or something to bolt into these and then provide the proper spacing for a disc brake calliper? Surely somebody has designed a solution to this problem?