My son has been on a 16" Flow for almost 2 years now. I recently started working upgrading him to 20s and Flow appears to have gone out of business. Luckily I already had the 20" dropouts so I had a local wheel builder lace up some 20" hoops and I extended the brake hose and shifter cable. I am working on putting everything back together and the rear post mount 160mm brake adapter will not work. The front of the caliper housing makes contact with the top of the disc as you can see in the pic below. I also attached pics of the rotor and adapter since I am sure someone will ask me if I am sure the disc is 160. LOL Does anyone know if I am supposed to have a different adapter with the 20" dropouts??? Any advice would be greatly appreciated!