I currently have threaded bullseye hubs with a 7 spd Sachs freewheel. I'm not that concerned with going to 9-10 spds but wondered it anyone has had trouble with them for a long tour. Should I consider upgrading to a cassette hub? The Sachs freewheels are a pain to remove, and I usually need to take it to a LBS to remove it. There's only 1 or 2 bike shops near by that even have the tools to do this, so I have concerns if the freewheel breaks down while in mid tour.