Hello, I'm in the proccess of making a custom motorbicycle, and I plan to use a internally geared hub. I live in Argentina, so I don't have many options. First of all, it HAS to have rollerbrakes or discmount because my rim doesn't allow me to use rimbrakes. I don't know any other brake that isn't coaster or v-brake type, excluding disc but i could not find any geared hub for discbrake. (In Argentina) I could find some old and used SA very cheap, but i don't know if they will hold up. I've read that they don't, buy maybe the old ones was better constructed? Someone knows? On the other side, a local bicycle shop has a Nexus 7 w/ coaster brake (used). I was going to buy it but the guy said that he thinks it's broken or misadjusted (he will check it). And also i've emailed and called arround 15/20 bicycle shops in my country, and one has a Nexus 8 without brakes (maybe I could put a rollerbrake?), and other guy told me that they could get the 4 and 7 speeds. My best bet is the 4 speed with a rollerbrake, but i'm not sure if they ever existed (maybe they came only with coaster brakes?). And, would they hold up? I read that the 3 speed won't and the 7 will, but i don't know about the rare 4 speed. The nexus 8 is a nice option, but it costs 250$ and i would have to add a rollerbrake (that i'm not sure if i could find it). Shimano alfine, Sram, sachs, new SA and all other are discarted because none sell them. If someone wants to follow my build log, go to Born to be Freak Thanks in advance, I will super appreciate any help.