Welcome to the new and improved Proflex / K2 Tech Forum!
How do you put Disk Brakes on it, I don't think that any kind of adaptor would work there, only option would be internal drum brakes.BTW have you ever seen the brakes wich works then you turn your pedals other way/ backward. we used to have it in Ukraine (same thing in Russia), the bikes were single speed, with no front brakes, I remember those brake were pretty good, and worked in any kind of weather. anything like that in states? or other countries?