I have a GT outpost all terra bike that I bought at a thrift store and was wondering if I can upgrade the brakes to Disc brakes without much modification
NO you cannot the fork will not allow it or the seat stay on the frame do not have the mounts for the calliper - they arent there! New wheels would be needed even if you could on the frame , estimated cost (with Tektro aguria comp disc & wheels $400 +/-). Sorry but you cant on this model and I sell the GT brand bike too so I know. If you had this one: http://www.performancebike.com/bikes/Product_10052_10551_1074166_-1_51000_20000_51506 you wouldnt have to worry about it.