ll it work with an internal hub or drum brake?
An internal hub is no problem, and neither is a drum brake, though you may need to bend the retention arm of the hub to reach the Short Stay. Hardware stores sell rubber coated clamps for less than a dollar that you can use to secure the retention arm to the (larger-diameter) Short Stay. One caveat: for hilly terrain, our opinion is that an internal hub doesn’t have enough range and a roller brake may not have enough stopping power for a loaded bike. For the flats, both are fine.