Well, I'm no bike mechanic but I had a lady bring her bike into my automotive shop to have me put a new tube in her rear tire. It had an IGH, something I've never dealt with before. On the non-drive side of the rear axle, there was a little black "box," for lack of a better word, on the end of the gear shift cable connected over the nut holding the wheel onto the frame. It had a hex screw which needed to be loosened, then just slid off a cable or rod (don't remember exactly) which was sticking out of the IGH. It was then a simple matter to unscrew the nuts holding the wheel to the bike then remove it in the normal manner. To reassemble, I put everything back together in the reverse way, sliding the cable connector onto the cable sticking out of the IGH and tightening the hex screw. I then took it on a short test ride to make sure I put it back together correctly, and it worked just fine.